pwm: lpss: use devm_pm_runtime_enable() helper

Use devm_pm_runtime_enable() helper to enable runtime PM and drop redundant
platform ->remove() callback.

Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Raag Jadav <raag.jadav@intel.com>
Link: https://lore.kernel.org/r/20240605131533.20037-2-raag.jadav@intel.com


Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>