device/mmio.h: Add include file for MMIO ops

MMIO operations are arch-agnostic so the include
path should not be arch/.

Change-Id: I0fd70f5aeca02e98e96b980c3aca0819f5c44b98
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/31691
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/include/device/pci.h

@@ -19,12 +19,11 @@
 
 #include <stdint.h>
 #include <stddef.h>
-#include <arch/io.h>
 #include <device/pci_def.h>
 #include <device/resource.h>
 #include <device/device.h>
 #include <device/pci_rom.h>
-
+#include <device/pci_type.h>
 
 /* Common pci operations without a standard interface */
 struct pci_operations {