efi_selftest: allow building relocation code on x86_64

efi_selftest: allow building relocation code on x86_64

Variables EFI_RELOC and EFI_CRT0 have to be defined to build the
EFI unit tests. This patch ensures this for the x86 architecure.

If we compile with EFI_STUB, the bitness depends on CONFIG_EFI_STUB_64BIT.
Otherwise the bitness depends on CONFIG_X86_64.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Alexander Graf <agraf@suse.de>