ARM: mxs: enable pinctrl support

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index cf006d4..c67494f 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -469,6 +469,7 @@
 	select CLKDEV_LOOKUP
 	select CLKSRC_MMIO
 	select HAVE_CLK_PREPARE
+	select PINCTRL
 	help
 	  Support for Freescale MXS-based family of processors