gru: kevin: define GPIOs used on both platforms

The same GPIOs are used on both platforms, definitions are added an a
new .h to make it easier to re-use them across the code.

BRANCH=none
BUG=chrome-os-partner:51537
TEST=panel backlight still enabled on Gru as before. The rest of the
     GPIOs are used in the upcoming patches.

Change-Id: If06f4b33720ab4bf098d23fb91322bba23fe6e90
Signed-off-by: Martin Roth <martinroth@chromium.org>
Original-Commit-Id: c587880
Original-Change-Id: I1a6c5b5beb82ffcc5fea397e8e9ec2f183f4a7e0
Original-Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/346219
Original-Tested-by: Shunqian Zheng <zhengsq@rock-chips.com>
Reviewed-on: https://review.coreboot.org/15029
Tested-by: build bot (Jenkins)
Reviewed-by: Furquan Shaikh <furquan@google.com>
diff --git a/src/mainboard/google/gru/mainboard.c b/src/mainboard/google/gru/mainboard.c
index 0ccedd3..54443bc 100644
--- a/src/mainboard/google/gru/mainboard.c
+++ b/src/mainboard/google/gru/mainboard.c
@@ -25,6 +25,8 @@
 #include <soc/grf.h>
 #include <soc/i2c.h>
 
+#include "board.h"
+
 static void configure_emmc(void)
 {
 	/* Host controller does not support programmable clock generator.