platform: cznic: turris-omnia-mcu: Inform about missing LED panel brightness...

platform: cznic: turris-omnia-mcu: Inform about missing LED panel brightness change interrupt feature

When reading MCU firmware features, check also for the LED panel
brightness change interrupt feature, and suggest upgrading the firmware
if it is missing.

Signed-off-by: Marek Behún <kabel@kernel.org>
Link: https://lore.kernel.org/r/20241111100355.6978-9-kabel@kernel.org


Signed-off-by: Lee Jones <lee@kernel.org>