lantiq: Introduce DWC2 compatible DTS definitions for AR9 USB

Since the AR9 USB is very similar to the VR9 USB it too can be used with
the upstream DWC2 driver.

Here are the DTS definitions which make it compatible with the DWC2
driver.

Signed-off-by: Antti Seppälä <a.seppala@gmail.com>

SVN-Revision: 46914

target/linux/lantiq/dts/ar9.dtsi

@@ -115,7 +115,7 @@
 		};
 
 		ifxhcd@E101000 {
-			compatible = "lantiq,ifxhcd-arx100";
+			compatible = "lantiq,ifxhcd-arx100", "lantiq,ifxhcd-arx100-dwc2";
 			reg = <0xE101000 0x1000
 				0xE120000 0x3f000>;
 			interrupt-parent = <&icu0>;
@@ -123,6 +123,15 @@
 			status = "disabled";
 		};
 
+		ifxhcd@E106000 {
+			compatible = "lantiq,ifxhcd-arx100-dwc2";
+			reg = <0xE106000 0x1000
+				0xE1E0000 0x3f000>;
+			interrupt-parent = <&icu0>;
+			interrupts = <91>;
+			status = "disabled";
+		};
+
 		deu@E103100 {
 			compatible = "lantiq,deu-arx100";
 			reg = <0xE103100 0xf00>;