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/Makefile b/drivers/pinctrl/uniphier/Makefile
index c6cc13d..bea4dd8 100644
--- a/drivers/pinctrl/uniphier/Makefile
+++ b/drivers/pinctrl/uniphier/Makefile
@@ -10,3 +10,4 @@
 obj-$(CONFIG_PINCTRL_UNIPHIER_PRO5)	+= pinctrl-uniphier-pro5.o
 obj-$(CONFIG_PINCTRL_UNIPHIER_PXS2)	+= pinctrl-uniphier-pxs2.o
 obj-$(CONFIG_PINCTRL_UNIPHIER_LD6B)	+= pinctrl-uniphier-ld6b.o
+obj-$(CONFIG_PINCTRL_UNIPHIER_LD20)	+= pinctrl-uniphier-ld20.o