Add SetLED macro to hide implementation details for LED handling

alsa-project/alsa-ucm-conf pull request #517 was opened from perexg:

This change also reduces modprobe calls when settings is split to multiple configuration files.

Request URL : https://github.com/alsa-project/alsa-ucm-conf/pull/517 Patch URL : https://github.com/alsa-project/alsa-ucm-conf/pull/517.patch Repository URL: https://github.com/alsa-project/alsa-ucm-conf