Generalize multicolor_brightness function as the implementation is the
same for most of the lp55xx based LED driver.
Suggested-by: Lee Jones <lee@kernel.org>
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
Link: https://lore.kernel.org/r/20240626160027.19703-12-ansuelsmth@gmail.comSigned-off-by: Lee Jones <lee@kernel.org>