Add support for qemuarm/64 machines with EFI

Fixes #667 (closed) Fixes docs#126 (closed)

TODO (do not merge if any pending):

• update docs
• mention new machines in build templates
• upstream edk2 and grub/grub-efi fixes - #766
• upstream the machines - #767 (closed)
• ci
• add ci jobs docs - #765
• drop unsupported machines from everywhere in this repo (qemuarm, qemuarm64, generic...)
• cleanup machine defconfigs - #770 (closed)

meta-oniro-core/classes/oniro-image.bbclass

@@ -46,9 +46,6 @@ WKS_FILE:qemux86-64 ?= "x-gpt-efi-disk.wks.in"
 WKS_FILE_DEPENDS:qemux86-64 += "ovmf"
 WKS_FILE_DEPENDS:qemux86 += "ovmf"
 
-WKS_FILE:qemu-generic-arm64 = "x-qemu-efi-disk.wks.in"
-IMAGE_FSTYPES:qemu-generic-arm64 += "wic wic.qcow2"
-
 WKS_FILE:seco-imx8mm-c61-2gb ?= "x-imx-uboot-bootpart.wks.in"
 IMAGE_FSTYPES:seco-imx8mm-c61-2gb ?= "wic.gz wic.bmap"