drivers: led_pwm: Fix power management action callback
drivers: led_pwm: Fix power management action callback

A single PWM driver can be used for multiple LED numbers. In that
case -EALREADY may be reported. It should be ignored.

Signed-off-by: Marek Pieta <d27fd21839ecf9c86fcf0dd8561035831899cc5a@nordicsemi.no>

finikorg/zephyr,galak/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,galak/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr