ARM: dts: am57xx-idk: Enable dual role for USB2 port

Dual-role support was added in v4.12. We should be using
it for USB2 port on the am57xx-idk.

Cc: <stable@vger.kernel.org>        [4.16+]
Reported-by: Bin Liu <b-liu@ti.com>
Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/dts/am571x-idk.dts

@@ -66,10 +66,6 @@ mmc0-led {
 	};
 };
 
-&omap_dwc3_2 {
-	extcon = <&extcon_usb2>;
-};
-
 &extcon_usb2 {
 	id-gpio = <&gpio5 7 GPIO_ACTIVE_HIGH>;
 	vbus-gpio = <&gpio7 22 GPIO_ACTIVE_HIGH>;

arch/arm/boot/dts/am572x-idk-common.dtsi

@@ -57,10 +57,6 @@ mmc0-led {
 	};
 };
 
-&omap_dwc3_2 {
-	extcon = <&extcon_usb2>;
-};
-
 &extcon_usb2 {
 	id-gpio = <&gpio3 16 GPIO_ACTIVE_HIGH>;
 	vbus-gpio = <&gpio3 26 GPIO_ACTIVE_HIGH>;

arch/arm/boot/dts/am57xx-idk-common.dtsi

@@ -395,8 +395,13 @@ &usb1 {
 	dr_mode = "host";
 };
 
+&omap_dwc3_2 {
+	extcon = <&extcon_usb2>;
+};
+
 &usb2 {
-	dr_mode = "peripheral";
+	extcon = <&extcon_usb2>;
+	dr_mode = "otg";
 };
 
 &mmc1 {