ARM: dts: imx6sx: Fix usbmisc compatible string

Fix usbmisc compatible string so that usbmisc node can be found and USB
functionality can be functional.
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Shawn Guo <shawn.guo@freescale.com>

arch/arm/boot/dts/imx6sx.dtsi

@@ -754,7 +754,7 @@ usbh: usb@02184400 {
 
 			usbmisc: usbmisc@02184800 {
 				#index-cells = <1>;
-				compatible = "fsl,imx6sx-usbmisc";
+				compatible = "fsl,imx6sx-usbmisc", "fsl,imx6q-usbmisc";
 				reg = <0x02184800 0x200>;
 				clocks = <&clks IMX6SX_CLK_USBOH3>;
 			};