arm: dts: fsl-ls1088a: sync usb controller nodes with Linux

arm: dts: fsl-ls1088a: sync usb controller nodes with Linux

Synchronise the USB device tree definition with Linux, allowing
the U-Boot control FDT to be used to boot a Linux system with
working USB.

An extra compatible string, "fsl,layerscape-dwc3" is needed
for special handling in U-Boot, so has been added to the
-u-boot.dtsi file. It might be better to add this to the
Linux source bindings.

Signed-off-by: Mathew McBride <matt@traverse.com.au>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Tested-by: Ioana Ciornei <ioana.ciornei@nxp.com> # on LS1088A-RDB