leds: leds-pca995x: Add support for NXP PCA9956B

leds: leds-pca995x: Add support for NXP PCA9956B

[ Upstream commit 68d6520d2e76998cdea58f6dd8782de5ab5b28af ]

Add support for PCA9956B chip, which belongs to the same family.

This chip features 24 instead of 16 outputs, so add a chipdef struct to
deal with the different register layouts.

Reviewed-by: Marek Vasut <marex@denx.de>
Signed-off-by: Pieterjan Camerlynck <pieterjanca@gmail.com>
Link: https://lore.kernel.org/r/20240711-pca995x-v4-2-702a67148065@gmail.com
Signed-off-by: Lee Jones <lee@kernel.org>
Stable-dep-of: 82c5ada1f9d0 ("leds: pca995x: Fix device child node usage in pca995x_probe()")
Signed-off-by: Sasha Levin <sashal@kernel.org>