ARM: dts: imx: b850v3: Disable unused usdhc4

Disable the unused interface, to fix print an error message during boot:
  mmc3: Failed to initialize a non-removable card

Signed-off-by: Ian Ray <ian.ray@gehealthcare.com>
Signed-off-by: Frank Li <Frank.Li@nxp.com>

Author: iangehc

arch/arm/boot/dts/nxp/imx/imx6q-b850v3.dts

@@ -303,3 +303,7 @@
 		phy-handle = <&switchphy4>;
 	};
 };
+
+&usdhc4 {
+	status = "disabled";
+};