Port all users of 'set_conf_file' to use the built-in rules
instead. This follows the convention-over-configuration principle to
make the system as a whole simpler and more consistent.
Signed-off-by: Sebastian Bøe <sebastian.boe@nordicsemi.no>
Add a sample demonstrating usage of the APA102 driver, heavily based
on led_ws2812. Tested on nucleo_l432kc with an Adafruit DotStar strip.
Signed-off-by: Marc Pignat <marc@absintheaudio.com>