pinctrl: sunxi: Move the Allwinner pinctrl driver to its own directory

This will allow to create numerous files without crippling the main pinctrl
directory.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index 934fd89..4508f6a 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -291,11 +291,6 @@
 	select PINMUX
 	select GPIOLIB_IRQCHIP
 
-config PINCTRL_SUNXI
-	bool
-	select PINMUX
-	select GENERIC_PINCONF
-
 config PINCTRL_ST
 	bool
 	depends on OF
@@ -392,6 +387,7 @@
 source "drivers/pinctrl/mvebu/Kconfig"
 source "drivers/pinctrl/sh-pfc/Kconfig"
 source "drivers/pinctrl/spear/Kconfig"
+source "drivers/pinctrl/sunxi/Kconfig"
 source "drivers/pinctrl/vt8500/Kconfig"
 
 config PINCTRL_XWAY