exynos: dts: Add USB VBUS GPIOs to the device tree

This patch adds a new samsung,vbus-gpio parameter to the device tree, in
preparation of replacing the currently hardcoded VBUS GPIO mechanism in
exynos5-dt.c with a device tree controlled solution, just as it already
exists in the Linux kernel.

Signed-off-by: Julius Werner <jwerner@chromium.org>
Signed-off-by: Vivek Gautam <gautam.vivek@samsung.com>
Cc: Simon Glass <sjg@chromium.org>
Cc: Minkyu Kang <mk7.kang@samsung.com>
Cc: Marek Vasut <marex@denx.de>

board/samsung/dts/exynos5250-smdk5250.dts

@@ -144,4 +144,8 @@
 	mmc@12230000 {
 		status = "disabled";
 	};
+
+	ehci@12110000 {
+		samsung,vbus-gpio = <&gpio 0xbe 0>; /* X26 */
+	};
 };

board/samsung/dts/exynos5250-snow.dts

@@ -109,6 +109,14 @@
 		status = "disabled";
 	};
 
+	ehci@12110000 {
+		samsung,vbus-gpio = <&gpio 0xb1 0>; /* X11 */
+	};
+
+	xhci@12000000 {
+		samsung,vbus-gpio = <&gpio 0xbf 0>; /* X27 */
+	};
+
 	tmu@10060000 {
 		samsung,min-temp	= <25>;
 		samsung,max-temp	= <125>;