Each nibble represents 4 LEDs, and in case of the higher register, bit 0
represents LED 4, so we need to use modulus for the LED number as well.

Fixes: fd7b025a ("leds: add BCM6328 LED driver")
Signed-off-by: NJonas Gorski <jonas.gorski@gmail.com>
Acked-by: NÁlvaro Fernández Rojas <noltari@gmail.com>
Signed-off-by: NJacek Anaszewski <jacek.anaszewski@gmail.com>