[][kernel][common][leds][Add backport leds pwm multicolor from kernel 6.4]

[Description]
Add backport leds pwm multicolor and dependency leds class multicolor
from kernel 6.4 which supports for PWM driven monochrome LEDs
that are grouped into multicolor LEDs.

[Release-log]
N/A

Change-Id: I0bac4664bf39699369b6a0aa4af68bd49c60061d
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/8372496
1 file changed