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/Kconfig b/drivers/pinctrl/mediatek/Kconfig
index e0145b1..1bd9a92 100644
--- a/drivers/pinctrl/mediatek/Kconfig
+++ b/drivers/pinctrl/mediatek/Kconfig
@@ -4,6 +4,10 @@
 	depends on PINCTRL_GENERIC
 	bool
 
+config PINCTRL_MT7623
+	bool "MT7623 SoC pinctrl driver"
+	select PINCTRL_MTK
+
 config PINCTRL_MT7629
 	bool "MT7629 SoC pinctrl driver"
 	select PINCTRL_MTK