pinctrl: uniphier: support UniPhier PH1-LD20 pinctrl driver

Add pin configuration and pinmux support for UniPhier PH1-LD20 SoC.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/drivers/pinctrl/uniphier/Kconfig b/drivers/pinctrl/uniphier/Kconfig
index d22d485..626df8e 100644
--- a/drivers/pinctrl/uniphier/Kconfig
+++ b/drivers/pinctrl/uniphier/Kconfig
@@ -39,4 +39,10 @@
 	default y
 	select PINCTRL_UNIPHIER
 
+config PINCTRL_UNIPHIER_LD20
+	bool "UniPhier PH1-LD20 SoC pinctrl driver"
+	depends on ARCH_UNIPHIER_LD20
+	default y
+	select PINCTRL_UNIPHIER
+
 endif