ARM: dts: imx51-babbage: Pass the USB PHY regulator

The USB PHYs are supplied via MC13892 VUSB regulator rail,
so properly describe this in the device tree.
Signed-off-by: NFabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: NShawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx51-babbage.dts

@@ -165,6 +165,7 @@
 			clocks = <&clks IMX5_CLK_DUMMY>;
 			clock-names = "main_clk";
 			reset-gpios = <&gpio2 5 GPIO_ACTIVE_LOW>;
+			vcc-supply = <&vusb_reg>;
 			#phy-cells = <0>;
 		};
 	};
@@ -241,6 +242,10 @@
 				regulator-max-microvolt = <3150000>;
 			};
 
+			vusb_reg: vusb {
+				regulator-boot-on;
+			};
+
 			vusb2_reg: vusb2 {
 				regulator-min-microvolt = <2400000>;
 				regulator-max-microvolt = <2775000>;
@@ -414,6 +419,10 @@
 	status = "okay";
 };
 
+&usbphy0 {
+	vcc-supply = <&vusb_reg>;
+};
+
 &usbotg {
 	dr_mode = "otg";
 	disable-over-current;