ARM: dts: imx6qdl-sabrelite: explicitly set pad for SGTL5000 sys_mclk

Explicitly sets the pad GPIO_0 (sys_mclk) to 0x030b0.

Before this patch, it has the value 0x130b0 if using mainline u-boot.
So this patch also removes hysteresis. The 100k pulldown remains so
that a disabled clock will be low.
Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

arch/arm/boot/dts/imx6qdl-sabrelite.dtsi

@@ -114,7 +114,8 @@ &iomuxc {
 	imx6q-sabrelite {
 		pinctrl_hog: hoggrp {
 			fsl,pins = <
-				MX6QDL_PAD_GPIO_0__CCM_CLKO1    0x80000000
+				/* SGTL5000 sys_mclk */
+				MX6QDL_PAD_GPIO_0__CCM_CLKO1    0x030b0
 			>;
 		};