usb: dwc3: dwc3-octeon: Dump control register on clock init failure

It might be interesting to know control register value in case
clock fails to enable.

Signed-off-by: Ladislav Michl <ladis@linux-mips.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Acked-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Link: https://lore.kernel.org/r/ZMd/5OX9szEMnhQH@lenoch


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