ARM: dts: Update echi-omap DT binding example usage

Remove non-compatible id from examples.

CC: Alan Stern <stern@rowland.harvard.edu>
CC: Nishant Menon <nm@ti.com>
CC: Kevin Hilman <khilman@linaro.org>
Signed-off-by: NRoger Quadros <rogerq@ti.com>
Signed-off-by: NTony Lindgren <tony@atomide.com>

Documentation/devicetree/bindings/usb/ehci-omap.txt

@@ -21,7 +21,7 @@ Documentation/devicetree/bindings/mfd/omap-usb-host.txt
 Example for OMAP4:
 
 usbhsehci: ehci@4a064c00 {
-	compatible = "ti,ehci-omap", "usb-ehci";
+	compatible = "ti,ehci-omap";
 	reg = <0x4a064c00 0x400>;
 	interrupts = <0 77 0x4>;
 };

Documentation/devicetree/bindings/usb/ohci-omap3.txt

@@ -9,7 +9,7 @@ Required properties:
 Example for OMAP4:
 
 usbhsohci: ohci@4a064800 {
-	compatible = "ti,ohci-omap3", "usb-ohci";
+	compatible = "ti,ohci-omap3";
 	reg = <0x4a064800 0x400>;
 	interrupts = <0 76 0x4>;
 };