leds-pca9633: Add support for PCA9634

Add support for PCA9634 chip, which belongs to the same family as the
9633 but with support for 8 outputs instead of 4.

Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>

diff --cc Documentation/devicetree/bindings/leds/pca9633.txt
Simple merge

diff --cc drivers/leds/Kconfig
Simple merge

diff --cc drivers/leds/leds-pca9633.c
Simple merge