ARM: dts: imx6dl: add a gpio for hog

The SPI/NOR needs this gpio for CS.
So add this gpio in the hog pinctrl.
Signed-off-by: NHuang Shijie <b32955@freescale.com>
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

arch/arm/boot/dts/imx6dl-sabreauto.dts

@@ -25,6 +25,7 @@
 			fsl,pins = <
 				MX6DL_PAD_NANDF_CS2__GPIO6_IO15 0x80000000
 				MX6DL_PAD_SD2_DAT2__GPIO1_IO13  0x80000000
+				MX6DL_PAD_EIM_D19__GPIO3_IO19 	0x80000000
 			>;
 		};
 	};