southbridge/intel/lynxpoint: Use common gpio.c

Use shared gpio code from common folder, except for
INTEL_LYNXPOINT_LP, which has it's own gpio code.

Needs test on real hardware !

Change-Id: Iccc6d254bafb927b6470704cec7c9dd7528e2c68
Signed-off-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-on: https://review.coreboot.org/13615
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>

src/southbridge/intel/lynxpoint/pcie.c

@@ -20,6 +20,7 @@
 #include <device/pciexp.h>
 #include <device/pci_ids.h>
 #include "pch.h"
+#include <southbridge/intel/common/gpio.h>
 
 static void pcie_update_cfg8(device_t dev, int reg, u8 mask, u8 or);
 static void pcie_update_cfg(device_t dev, int reg, u32 mask, u32 or);