pwm: dwc: simplify error handling

Simplify error handling in ->probe() function using dev_err_probe() helper
and while at it, drop error codes from the message to prevent duplication.

Signed-off-by: Raag Jadav <raag.jadav@intel.com>
Tested-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Link: https://lore.kernel.org/r/20240219033835.11369-5-raag.jadav@intel.com


Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>