arm64: dts: imx8mp: Use the correct name for child node "snps, dwc3"

After the node name of "snps,dwc3" has been corrected to start with "usb"
in fsl,imx8mp-dwc3.yaml. Its name in dts should be modified accordingly.
Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
Link: https://lore.kernel.org/r/20210329072714.2135-3-thunder.leizhen@huawei.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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

@@ -828,7 +828,7 @@ usb3_0: usb@32f10100 {
 			ranges;
 			status = "disabled";
 
-			usb_dwc3_0: dwc3@38100000 {
+			usb_dwc3_0: usb@38100000 {
 				compatible = "snps,dwc3";
 				reg = <0x38100000 0x10000>;
 				clocks = <&clk IMX8MP_CLK_HSIO_AXI>,
@@ -869,7 +869,7 @@ usb3_1: usb@32f10108 {
 			ranges;
 			status = "disabled";
 
-			usb_dwc3_1: dwc3@38200000 {
+			usb_dwc3_1: usb@38200000 {
 				compatible = "snps,dwc3";
 				reg = <0x38200000 0x10000>;
 				clocks = <&clk IMX8MP_CLK_HSIO_AXI>,