- Split preferences from audio category to avoid removing whole category upon nonexsting single preference
- Previously there were only headphone and microphone gain which were from same kernel driver and it was logical
to remove the category when one of the preferences does not exist.
* SharedPreference cannot be used untill device is unlocked
* This causes crashing the app at boot
Thanks to java gawd StYlOg for help me fixing this
Signed-off-by: OdSazib <odsazib@gmail.com>