leds: pwm-multicolor: Disable PWM when going to suspend

This fixes suspend on platforms like stm32mp1xx, where the PWM consumer
has to be disabled for the PWM to enter suspend.
Another positive side effect is that active-low LEDs now properly
turn off instead of going back to full brightness when they are set to 0.

Link: https://lore.kernel.org/all/20240417153846.271751-2-u.kleine-koenig@pengutronix.de/


Signed-off-by: Jakob Riepler <jakob+lkml@paranoidlabs.org>
Acked-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
Link: https://lore.kernel.org/r/20241216213754.18374-2-jakob+lkml@paranoidlabs.org


Signed-off-by: Lee Jones <lee@kernel.org>