arm64: dts: imx8mp: disable usb3_phy1

Like usb3_phy0 the default state of the usb3_phy1 should be disabled, so
it is only enabled on boards exposing this USB port.
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8mp.dtsi

@@ -958,6 +958,7 @@ usb3_phy1: usb-phy@382f0040 {
 			assigned-clocks = <&clk IMX8MP_CLK_USB_PHY_REF>;
 			assigned-clock-parents = <&clk IMX8MP_CLK_24M>;
 			#phy-cells = <0>;
+			status = "disabled";
 		};
 
 		usb3_1: usb@32f10108 {