mx6sabresd: Select pinctrl driver

With the conversion to DM we should select the pinctrl driver.
Signed-off-by: NFabio Estevam <festevam@gmail.com>

configs/mx6sabresd_defconfig

@@ -82,6 +82,8 @@ CONFIG_SF_DEFAULT_SPEED=20000000
 CONFIG_SPI_FLASH_STMICRO=y
 CONFIG_PHYLIB=y
 CONFIG_MII=y
+CONFIG_PINCTRL=y
+CONFIG_PINCTRL_IMX6=y
 CONFIG_PCI=y
 CONFIG_DM_REGULATOR=y
 CONFIG_SPI=y