nb/intel/x4x: Drop unused `pci_ops.h` include

Tested with BUILD_TIMELESS=1, Intel DG43GT does not change.

Change-Id: I58162865d596574b8a52447624f0102b8dceefa4
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/42156
Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/northbridge/intel/x4x/romstage.c

@@ -1,6 +1,5 @@
 /* SPDX-License-Identifier: GPL-2.0-or-later */
 
-#include <device/pci_ops.h>
 #include <console/console.h>
 #include <southbridge/intel/common/pmclib.h>
 #include <northbridge/intel/x4x/x4x.h>