dt-bindings: usb: dwc3-xilinx: Convert USB DWC3 bindings

Convert USB DWC3 bindings to DT schema format using json-schema.

Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Manish Narani <manish.narani@xilinx.com>
Link: https://lore.kernel.org/r/1638808021-26921-1-git-send-email-manish.narani@xilinx.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>