x86/vga: fix build with efi disabled.

Reported by sfr on -next merge.

Signed-off-by: Dave Airlie <[e-mail]>

arch/x86/pci/fixup.c

···
 #include <linux/dmi.h>
 #include <linux/pci.h>
 #include <linux/init.h>
+#include <linux/vgaarb.h>
 #include <asm/pci_x86.h>
-#include <asm/vga.h>
 
 static void __devinit pci_fixup_i450nx(struct pci_dev *d)
 {