x86: qemu: efi: Add two boards for EFI 32-bit and 64-bit payload

This introduces two board defconfig files for generating EFI 32-bit
and 64-bit payloads, to run on QEMU x86 target.

With these in place, hopefully buildman will catch any build error
with EFI payload support on x86.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/board/emulation/qemu-x86/MAINTAINERS b/board/emulation/qemu-x86/MAINTAINERS
index ea4dd19..54dc2c5 100644
--- a/board/emulation/qemu-x86/MAINTAINERS
+++ b/board/emulation/qemu-x86/MAINTAINERS
@@ -4,3 +4,5 @@
 F:	board/emulation/qemu-x86/
 F:	include/configs/qemu-x86.h
 F:	configs/qemu-x86_defconfig
+F:	configs/qemu-x86_efi_payload32_defconfig
+F:	configs/qemu-x86_efi_payload64_defconfig