leds: is31f132xx: Add support for is31fl3293

leds: is31f132xx: Add support for is31fl3293

This chip supports 3 LED channels with 4096 possible PWM values.

Extend the driver to support this variant:

 * Make brightness steps configurable per device type
 * Handle dual-register brightness updates
 * Allow to specify values to write into the PWM update register
 * Add custom init and shutdown function for 3293 variant
 * Init registers after parsing DT properties

Signed-off-by: Daniel Mack <daniel@zonque.org>
Link: https://patch.msgid.link/20251219154521.643312-4-daniel@zonque.org
Signed-off-by: Lee Jones <lee@kernel.org>