glados: Abstract board GPIO configuration in gpio.h

Move all the various places that look at board specific GPIOs into
the mainboard gpio.h so it can be easily ported to new boards.

BUG=chrome-os-partner:40635
BRANCH=none
TEST=build and boot on glados p2

Original-Change-Id: I3f1754012158dd5c7d5bbd6e07e40850f21af56d
Original-Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/293942
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>

Change-Id: I93c4dc1795c1107a3d96e686f03df3199f30de8a
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: http://review.coreboot.org/11282
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
diff --git a/src/mainboard/google/glados/smihandler.c b/src/mainboard/google/glados/smihandler.c
index f9f4707..041d5dc 100644
--- a/src/mainboard/google/glados/smihandler.c
+++ b/src/mainboard/google/glados/smihandler.c
@@ -28,6 +28,7 @@
 #include <soc/pm.h>
 #include <soc/smm.h>
 #include "ec.h"
+#include "gpio.h"
 
 int mainboard_io_trap_handler(int smif)
 {