Add Avenger96 Linux support

Add required meta-layers to bblayers.conf.sample.
Add dependencies to local.conf.sample that provide necessary
packages to enable Ethernet, WiFi and Bluetooth connectivity.
Mention the board in README.

Signed-off-by: Wojciech Zmuda <wojciech.zmuda@huawei.com>

README.md

@@ -65,6 +65,7 @@ Supported machines:
 - qemuarm
 - qemuarm64
 - seco-intel-b68 (SECO intel B68)
+- stm32mp1-av96 (96Boards Avenger96)
 
 Example:
 

flavours/linux/bblayers.conf.sample

@@ -12,4 +12,9 @@ BBLAYERS ?= " \
   ##OEROOT##/../meta-ohos/meta-ohos-foundation \
   ##OEROOT##/../meta-intel \
   ##OEROOT##/../meta-seco-intel \
+  ##OEROOT##/../meta-openembedded/meta-oe \
+  ##OEROOT##/../meta-openembedded/meta-python \
+  ##OEROOT##/../meta-st-stm32mp \
+  ##OEROOT##/../meta-st-stm32mp-addons \
+  ##OEROOT##/../meta-av96 \
   "

flavours/linux/conf-notes.txt

@@ -6,12 +6,14 @@ You can now run 'bitbake <target>'
 Supported targets:
 - core-image-minimal
 - core-image-full-cmdline
+- core-image-base
 
 Supported machines:
 - qemux86-64 (default)
 - qemux86
 - qemuarm
 - qemuarm64
+- stm32mp1-av96 (96Boards Avenger96)
 
 MACHINE variable can be set up in conf/local.conf file under build directory
 or via command line, e.g.:

flavours/linux/local.conf.sample

@@ -23,6 +23,7 @@
 #MACHINE ?= "qemuppc"
 #MACHINE ?= "qemux86"
 #MACHINE ?= "qemux86-64"
+#MACHINE ?= "stm32mp1-av96"
 #
 # This sets the default machine to be qemux86 if no other machine is selected:
 MACHINE ??= "qemux86-64"
@@ -256,3 +257,7 @@ PACKAGECONFIG_append_pn-qemu-system-native = " sdl"
 # track the version of this file when it was generated. This can safely be ignored if
 # this doesn't mean anything to you.
 CONF_VERSION = "1"
+
+IMAGE_INSTALL_appned = "dhcp-client dropbear packagegroup-base-wifi iw bluez5 obexftp"
+IMAGE_INSTALL_append_stm32mp1-av96 += "av96-root-files"
+