ovmf: Backport patches for python 3.9++ support

When building with Python 3.9+ on the host, there are various ways the
build will fail. Fixes to address these issues are already in newer
version of the component so this only backports two related patches.

Signed-off-by: Andrei Gherzan <andrei.gherzan@huawei.com>

meta-ohos-staging/recipes-core/ovmf/files/0001-BaseTools-fix-ucs-2-lookup-on-python-3.9.patch

+From 5d8648345cd9ad729837118c731063c59edea192 Mon Sep 17 00:00:00 2001
+From: Cole Robinson <crobinso@redhat.com>
+Date: Wed, 12 Aug 2020 01:28:17 +0800
+Subject: [PATCH 1/1] BaseTools: fix ucs-2 lookup on python 3.9
+
+python3.9 changed/fixed codec.register behavior to always replace
+hyphen with underscore for passed in codec names:
+
+  https://bugs.python.org/issue37751
+
+So the custom Ucs2Search needs to be adapted to handle 'ucs_2' in
+addition to existing 'ucs-2' for back compat.
+
+This fixes test failures on python3.9, example:
+
+======================================================================
+FAIL: testUtf16InUniFile (CheckUnicodeSourceFiles.Tests)
+----------------------------------------------------------------------
+Traceback (most recent call last):
+  File "/builddir/build/BUILD/edk2-edk2-stable202002/BaseTools/Source/Python/AutoGen/UniClassObject.py", line 375, in PreProcess
+    FileIn = UniFileClassObject.OpenUniFile(LongFilePath(File.Path))
+  File "/builddir/build/BUILD/edk2-edk2-stable202002/BaseTools/Source/Python/AutoGen/UniClassObject.py", line 303, in OpenUniFile
+    UniFileClassObject.VerifyUcs2Data(FileIn, FileName, Encoding)
+  File "/builddir/build/BUILD/edk2-edk2-stable202002/BaseTools/Source/Python/AutoGen/UniClassObject.py", line 312, in VerifyUcs2Data
+    Ucs2Info = codecs.lookup('ucs-2')
+LookupError: unknown encoding: ucs-2
+
+Signed-off-by: Cole Robinson <crobinso@redhat.com>
+Reviewed-by: Yuwei Chen <yuwei.chen@intel.com>
+Reviewed-by: Bob Feng <bob.c.feng@intel.com>
+
+Upstream-Status: Backport
+---
+ BaseTools/Source/Python/AutoGen/UniClassObject.py | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/BaseTools/Source/Python/AutoGen/UniClassObject.py b/BaseTools/Source/Python/AutoGen/UniClassObject.py
+index b2895f7e5c..883c2356e0 100644
+--- a/BaseTools/Source/Python/AutoGen/UniClassObject.py
++++ b/BaseTools/Source/Python/AutoGen/UniClassObject.py
+@@ -152,7 +152,7 @@ class Ucs2Codec(codecs.Codec):
+ 
+ TheUcs2Codec = Ucs2Codec()
+ def Ucs2Search(name):
+-    if name == 'ucs-2':
++    if name in ['ucs-2', 'ucs_2']:
+         return codecs.CodecInfo(
+             name=name,
+             encode=TheUcs2Codec.encode,
+-- 
+2.31.1
+

meta-ohos-staging/recipes-core/ovmf/files/0002-BaseTools-Work-around-array.array.tostring-removal-i.patch

+From 43bec9ea3d56f3662ede78023baa2a791b66acac Mon Sep 17 00:00:00 2001
+From: Cole Robinson <crobinso@redhat.com>
+Date: Wed, 12 Aug 2020 01:28:18 +0800
+Subject: [PATCH 1/1] BaseTools: Work around array.array.tostring() removal in
+ python 3.9
+
+In python3, array.array.tostring() was a compat alias for tobytes().
+tostring() was removed in python 3.9.
+
+Convert this to use tolist() which should be valid for all python
+versions.
+
+This fixes this build error on python3.9:
+
+(Python 3.9.0b5 on linux) Traceback (most recent call last):
+  File "/root/edk2/edk2-edk2-stable202002/BaseTools/BinWrappers/PosixLike/../../Source/Python/Trim/Trim.py", line 593, in Main
+    GenerateVfrBinSec(CommandOptions.ModuleName, CommandOptions.DebugDir, CommandOptions.OutputFile)
+  File "/root/edk2/edk2-edk2-stable202002/BaseTools/BinWrappers/PosixLike/../../Source/Python/Trim/Trim.py", line 449, in GenerateVfrBinSec
+    VfrUniOffsetList = GetVariableOffset(MapFileName, EfiFileName, VfrNameList)
+  File "/root/edk2/edk2-edk2-stable202002/BaseTools/Source/Python/Common/Misc.py", line 88, in GetVariableOffset
+    return _parseForGCC(lines, efifilepath, varnames)
+  File "/root/edk2/edk2-edk2-stable202002/BaseTools/Source/Python/Common/Misc.py", line 151, in _parseForGCC
+    efisecs = PeImageClass(efifilepath).SectionHeaderList
+  File "/root/edk2/edk2-edk2-stable202002/BaseTools/Source/Python/Common/Misc.py", line 1638, in __init__
+    if ByteArray.tostring() != b'PE\0\0':
+AttributeError: 'array.array' object has no attribute 'tostring'
+
+Signed-off-by: Cole Robinson <crobinso@redhat.com>
+Reviewed-by: Yuwei Chen <yuwei.chen@intel.com>
+Reviewed-by: Bob Feng <bob.c.feng@intel.com>
+
+Upstream-Status: Backport
+---
+ BaseTools/Source/Python/Common/Misc.py | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/BaseTools/Source/Python/Common/Misc.py b/BaseTools/Source/Python/Common/Misc.py
+index ad55671080..4be7957138 100755
+--- a/BaseTools/Source/Python/Common/Misc.py
++++ b/BaseTools/Source/Python/Common/Misc.py
+@@ -1635,7 +1635,7 @@ class PeImageClass():
+         ByteArray = array.array('B')
+         ByteArray.fromfile(PeObject, 4)
+         # PE signature should be 'PE\0\0'
+-        if ByteArray.tostring() != b'PE\0\0':
++        if ByteArray.tolist() != [ord('P'), ord('E'), 0, 0]:
+             self.ErrorInfo = self.FileName + ' has no valid PE signature PE00'
+             return
+ 
+-- 
+2.31.1
+

meta-ohos-staging/recipes-core/ovmf/ovmf_%.bbappend

+FILESEXTRAPATHS_prepend := "${THISDIR}/files:"
+
+SRC_URI_append = "\
+    file://0001-BaseTools-fix-ucs-2-lookup-on-python-3.9.patch \
+    file://0002-BaseTools-Work-around-array.array.tostring-removal-i.patch \
+    "