ARM: dts: am57xx: sbc-am57x: add usb vbus pinmux

usb1_drvvbus pin is used to Drive-VBUS enable to external charge
pump/power switch.

Add a pinmux for that pin.
Signed-off-by: Dmitry Lifshitz <lifshitz@compulab.co.il>
Acked-by: Igor Grinberg <grinberg@compulab.co.il>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/dts/am57xx-sbc-am57x.dts

@@ -37,6 +37,12 @@ DRA7XX_CORE_IOPAD(0x376c, PIN_INPUT | MUX_MODE14)	/* mmc1_sdcd.gpio6_27 */
 			DRA7XX_CORE_IOPAD(0x377c, PIN_INPUT | MUX_MODE14)	/* mmc1_sdwp.gpio6_28 */
 		>;
 	};
+
+	usb1_pins: pinmux_usb1_pins {
+		pinctrl-single,pins = <
+			DRA7XX_CORE_IOPAD(0x3680, PIN_INPUT_SLEW | MUX_MODE0) /* usb1_drvvbus */
+		>;
+	};
 };
 
 &uart3 {
@@ -59,3 +65,8 @@ &mmc1 {
 	cd-gpios = <&gpio6 27 GPIO_ACTIVE_LOW>;
 	wp-gpios = <&gpio6 28 GPIO_ACTIVE_HIGH>;
 };
+
+&usb1 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&usb1_pins>;
+};