pinctrl: UniPhier: add UniPhier ProXstream2 pinctrl driver

Add pin configuration and pinmux support for UniPhier ProXstream2
SoC.

Changes in v2:
  - sort groups and funcs alphabetically
  - add i2c pin-mux settings
  - sort members of platform_driver
  - change to tristate
  - add THIS_MODULE to pinctrl_desc
  - use module_platform_driver

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/pinctrl/uniphier/Makefile b/drivers/pinctrl/uniphier/Makefile
index b0cd3e8..aed038c 100644
--- a/drivers/pinctrl/uniphier/Makefile
+++ b/drivers/pinctrl/uniphier/Makefile
@@ -4,3 +4,4 @@
 obj-$(CONFIG_PINCTRL_UNIPHIER_PH1_PRO4)		+= pinctrl-ph1-pro4.o
 obj-$(CONFIG_PINCTRL_UNIPHIER_PH1_SLD8)		+= pinctrl-ph1-sld8.o
 obj-$(CONFIG_PINCTRL_UNIPHIER_PH1_PRO5)		+= pinctrl-ph1-pro5.o
+obj-$(CONFIG_PINCTRL_UNIPHIER_PROXSTREAM2)	+= pinctrl-proxstream2.o