dts: dra7-evm: add USB support

Add USB pinmux information and USB modes
for the USB controllers.

CC: Benoît Cousson <bcousson@baylibre.com>
Reviewed-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/dts/dra7-evm.dts

@@ -108,6 +108,18 @@ qspi1_pins: pinmux_qspi1_pins {
 			0xbc (PIN_INPUT_PULLUP | MUX_MODE1)  /* gpmc_cs3.qspi1_cs1 */
 		>;
 	};
+
+	usb1_pins: pinmux_usb1_pins {
+                pinctrl-single,pins = <
+			0x280 (PIN_INPUT_SLEW | MUX_MODE0) /* usb1_drvvbus */
+                >;
+        };
+
+	usb2_pins: pinmux_usb2_pins {
+                pinctrl-single,pins = <
+			0x284 (PIN_INPUT_SLEW | MUX_MODE0) /* usb2_drvvbus */
+                >;
+        };
 };
 
 &i2c1 {
@@ -353,3 +365,15 @@ partition@9 {
 		};
 	};
 };
+
+&usb1 {
+	dr_mode = "peripheral";
+	pinctrl-names = "default";
+	pinctrl-0 = <&usb1_pins>;
+};
+
+&usb2 {
+	dr_mode = "host";
+	pinctrl-names = "default";
+	pinctrl-0 = <&usb2_pins>;
+};