mips: ath79: dts: Add generic-ehci node

Add generic EHCI node for the ChipIdea EHCI controller in the ath79.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Cc: Wills Wang <wills.wang@live.com>

arch/mips/dts/ar933x.dtsi

@@ -59,6 +59,13 @@
 			#address-cells = <1>;
 			#size-cells = <1>;
 
+			ehci0: ehci@1b000100 {
+				compatible = "generic-ehci";
+				reg = <0x1b000100 0x100>;
+
+				status = "disabled";
+			};
+
 			uart0: uart@18020000 {
 				compatible = "qca,ar9330-uart";
 				reg = <0x18020000 0x20>;