dt-bindings: usb: cdns-imx8qm: add imx8qm cdns3 glue layer

NXP imx8qm integrates 1 cdns3 IP. This is glue layer device bindings.

Signed-off-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230517152545.3404508-2-Frank.Li@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>