drivers/emulation/qemu: Add missing include for MMIO

Change-Id: Ie3c820e2e20f8f71908319e89e49e5d66f58adc9
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/58347
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/drivers/emulation/qemu/bochs.c

@@ -2,6 +2,7 @@
 
 #include <stdint.h>
 #include <arch/io.h>
+#include <arch/mmio.h>
 #include <console/console.h>
 #include <device/device.h>
 #include <device/pci.h>