leds: pwm-multicolor: Introduce default-intensity property

Like all LED drivers, pwm-multicolor supports turning on an LED on boot
by setting linux,default-trigger, e.g. to "default-on". pwm-multicolor
however scales the brightness of the color-component sub-LEDs with their
individual intensity value. Since these intensities are
zero-initialized, on boot a trigger is invisible until colors are set
from userspace.

Fix linux,default-trigger for pwm-multicolor by allowing for nonzero
default-intensities but default to 0 for backwards-compatibility.

Signed-off-by: Jonas Rebmann <jre@pengutronix.de>
Link: https://patch.msgid.link/20260605-multicolor-default-v2-2-ed07271df6b0@pengutronix.de
Signed-off-by: Lee Jones <lee@kernel.org>

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