ARM: am3517_evm: Enable Pinctrl

The simple pinctrl driver currently available works with the omap3.
Enabling this will use the device tree to automatically set the
pin-muxing for various drivers.
Signed-off-by: NAdam Ford <aford173@gmail.com>

configs/am3517_evm_defconfig

@@ -47,6 +47,8 @@ CONFIG_SPL_NAND_SIMPLE=y
 CONFIG_MII=y
 CONFIG_DRIVER_TI_EMAC=y
 # CONFIG_TWL4030_POWER is not set
+CONFIG_PINCTRL=y
+CONFIG_PINCTRL_SINGLE=y
 CONFIG_CONS_INDEX=3
 CONFIG_SYS_NS16550=y
 CONFIG_SPI=y