imx: mx6sxsabreauto: enable pinctrl driver

Enable pinctrl driver for mx6sxsabreauto board.
Signed-off-by: NPeng Fan <peng.fan@nxp.com>
Cc: Stefano Babic <sbabic@denx.de>

configs/mx6sxsabreauto_defconfig

@@ -28,6 +28,8 @@ CONFIG_OF_CONTROL=y
 CONFIG_SPI_FLASH=y
 CONFIG_SPI_FLASH_BAR=y
 CONFIG_SPI_FLASH_STMICRO=y
+CONFIG_PINCTRL=y
+CONFIG_PINCTRL_IMX6=y
 CONFIG_FSL_QSPI=y
 CONFIG_USB=y
 CONFIG_USB_STORAGE=y