dt-bindings: usb: Add bindings for multiport properties on DWC3 controller

Add bindings to indicate properties required to support multiport
on Synopsys DWC3 controller.

Signed-off-by: Krishna Kurapati <quic_kriskura@quicinc.com>
Reviewed-by: Bjorn Andersson <quic_bjorande@quicinc.com>
Reviewed-by: Johan Hovold <johan+linaro@kernel.org>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Tested-by: Johan Hovold <johan+linaro@kernel.org>
Link: https://lore.kernel.org/r/20240420044901.884098-2-quic_kriskura@quicinc.com


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