mediatek/mt8173: Add GPIO driver

BUG=none
TEST=emerge-oak coreboot
BRANCH=none

Change-Id: I54755d81144b27cc9a674434609b2d99f1d486ec
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: d88a3ed43ad32e245e54a9599fb8667ce288217b
Original-Change-Id: I1142091650c0de2207c7635031aa7edfe487ad88
Original-Signed-off-by: Biao Huang <biao.huang@mediatek.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/292672
Original-Commit-Ready: Yidi Lin <yidi.lin@mediatek.com>
Original-Tested-by: Yidi Lin <yidi.lin@mediatek.com>
Original-Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/12603
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
diff --git a/src/soc/mediatek/mt8173/Kconfig b/src/soc/mediatek/mt8173/Kconfig
index 0f0b134..6f23eba 100644
--- a/src/soc/mediatek/mt8173/Kconfig
+++ b/src/soc/mediatek/mt8173/Kconfig
@@ -12,6 +12,7 @@
 	select HAVE_MONOTONIC_TIMER
 	select GENERIC_UDELAY
 	select HAS_PRECBMEM_TIMESTAMP_REGION
+	select GENERIC_GPIO_LIB
 
 if SOC_MEDIATEK_MT8173