ralink: the mt7620 evb has a usb port

Signed-off-by: John Crispin <blogic@openwrt.org>

Backport of r42293

git-svn-id: svn://svn.openwrt.org/openwrt/branches/barrier_breaker@42385 3c298f89-4303-0410-b956-a3cf2f4a3e73

target/linux/ramips/dts/MT7620a.dts

@@ -116,4 +116,12 @@
 			linux,code = <0x101>;
 		};
 	};
+
+	ehci@101c0000 {
+		status = "okay";
+	};
+
+	ohci@101c1000 {
+		status = "okay";
+	};
 };