device/pci: Fix PCI accessor headers

PCI config accessors are no longer indirectly included
from <arch/io.h> use <device/pci_ops.h> instead.

Change-Id: I2adf46430a33bc52ef69d1bf7dca4655fc8475bd
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/31675
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
diff --git a/src/northbridge/intel/nehalem/raminit.c b/src/northbridge/intel/nehalem/raminit.c
index c730b5e..9812e53 100644
--- a/src/northbridge/intel/nehalem/raminit.c
+++ b/src/northbridge/intel/nehalem/raminit.c
@@ -18,6 +18,7 @@
 #include <console/console.h>
 #include <string.h>
 #include <arch/io.h>
+#include <device/pci_ops.h>
 #include <cpu/x86/msr.h>
 #include <cbmem.h>
 #include <arch/cbfs.h>