pinctrl: MediaTek: add pinctrl driver for MT7623 SoC

This patch adds pinctrl support for MT7623 SoC. And most of the
structures are used to hold the hardware configuration for each
pin.

Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
Tested-by: Matthias Brugger <matthias.bgg@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/pinctrl/mediatek/Makefile b/drivers/pinctrl/mediatek/Makefile
index cbf0765..f6ef362 100644
--- a/drivers/pinctrl/mediatek/Makefile
+++ b/drivers/pinctrl/mediatek/Makefile
@@ -3,4 +3,5 @@
 obj-$(CONFIG_PINCTRL_MTK) += pinctrl-mtk-common.o
 
 # SoC Drivers
+obj-$(CONFIG_PINCTRL_MT7623) += pinctrl-mt7623.o
 obj-$(CONFIG_PINCTRL_MT7629) += pinctrl-mt7629.o