Add QemuMacDrivers qemu_vga.ndrv revision d4e7d7a built as submodule

Signed-off-by: NMark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au>

Makefile

@@ -552,7 +552,8 @@ multiboot.bin linuxboot.bin linuxboot_dma.bin kvmvapic.bin \
 s390-ccw.img \
 spapr-rtas.bin slof.bin skiboot.lid \
 palcode-clipper \
-u-boot.e500
+u-boot.e500 \
+qemu_vga.ndrv
 else
 BLOBS=
 endif