dt-bindings: phy: mxs-usb-phy: convert to DT schema format

Convert the binding to DT schema format. Besides, this also add clocks,
'#phy-cells', phy-3p0-supply and power-domains properties which are not
contained in txt file due to txt file lack updates.

Signed-off-by: Xu Yang <xu.yang_2@nxp.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230613083445.1129137-1-xu.yang_2@nxp.com


Signed-off-by: Vinod Koul <vkoul@kernel.org>