tests: add simple test application for the led_controller module

Open-webOS-DCO-1.0-Signed-off-by: Simon Busch <morphis@gravedo.de>
led_controller: return proper callback status when set brightness operation fails

Open-webOS-DCO-1.0-Signed-off-by: Simon Busch <morphis@gravedo.de>
tuna: enable timedoutput based haptics module

Open-webOS-DCO-1.0-Signed-off-by: Simon Busch <morphis@gravedo.de>
haptics_timedoutput: implementation based on a linux timedoutput class device

Open-webOS-DCO-1.0-Signed-off-by: Simon Busch <morphis@gravedo.de>