mx6sabreauto: Select pinctrl driver

With the conversion to DM we should select the pinctrl driver.
Signed-off-by: NSjoerd Simons <sjoerd.simons@collabora.co.uk>
Reviewed-by: NPeng Fan <peng.fan@nxp.com>

configs/mx6sabreauto_defconfig

@@ -70,6 +70,8 @@ CONFIG_SF_DEFAULT_SPEED=20000000
 CONFIG_SPI_FLASH_STMICRO=y
 CONFIG_PHYLIB=y
 CONFIG_MII=y
+CONFIG_PINCTRL=y
+CONFIG_PINCTRL_IMX6=y
 CONFIG_DM_REGULATOR=y
 CONFIG_SPI=y
 CONFIG_DM_SPI=y