usb: dwc3: imx8mp: simplify with devm_clk_get_enabled

Use devm_clk_get_enabled() to drop clock preparing and handling from
error and remove paths.  This makes the code a bit simpler.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Acked-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Link: https://lore.kernel.org/r/20240814-b4-cleanup-h-of-node-put-usb-v1-4-95481b9682bc@linaro.org


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