pinctrl: uniphier: add UniPhier PH1-LD4 pinctrl driver

Add pin configuration and pinmux support for UniPhier PH1-LD4 SoC.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/drivers/pinctrl/uniphier/Kconfig b/drivers/pinctrl/uniphier/Kconfig
index 29a623d..03593cd 100644
--- a/drivers/pinctrl/uniphier/Kconfig
+++ b/drivers/pinctrl/uniphier/Kconfig
@@ -3,4 +3,10 @@
 config PINCTRL_UNIPHIER_CORE
 	bool
 
+config PINCTRL_UNIPHIER_PH1_LD4
+	bool "UniPhier PH1-LD4 SoC pinctrl driver"
+	depends on MACH_PH1_LD4
+	default y
+	select PINCTRL_UNIPHIER_CORE
+
 endif