During migration to HWMv2 separate specific defconfig file was removed
for GICv3 version of virtual xenvm boards. It worked fine before
commit 0be0d2175b ("cmake: modules: extensions: Revert using common
board files") significantly changed build behavior, but did not return
previously removed file. This led to build/runtime issues, when some of
the Kconfig options were not selected.
Return GICv3 specific defconfig to board directory to fix configuration
problems.
Signed-off-by: Dmytro Firsov <dmytro_firsov@epam.com>