arm64: dts: im8mq-librem5: move dwc3 usb port under ports

arm64: dts: im8mq-librem5: move dwc3 usb port under ports

Move port@0 and port@1 under ports to fix below DTB_CHECK warnings.

arch/arm64/boot/dts/freescale/imx8mq-librem5-devkit.dtb: usb@38100000: port@0:reg:0:0: 0 is less than the minimum of 1
	from schema $id: http://devicetree.org/schemas/usb/snps,dwc3.yaml#
arch/arm64/boot/dts/freescale/imx8mq-librem5-devkit.dtb: usb@38100000: Unevaluated properties are not allowed ('#address-cells', '#size-cells', 'dr_mode', 'phy-names', 'phys', 'port@0', 'port@1', 'snps,parkmode-disable-ss-quirk' were unexpected)
	from schema $id: http://devicetree.org/schemas/usb/snps,dwc3.yaml#

Signed-off-by: Frank Li <Frank.Li@nxp.com>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>