overlay: move Phone to Telephony

Change-Id: I6c05c23ccca210109a5c57c1edbda8b106e6526a
Update audio_policy

Fixes audio players
Update phone characteristics

Signed-off-by: Varun Chitre <varun.chitre15@gmail.com>
c2105: improved backlight curve

The curve is now linear on a logarithmic scale. Also increases the
number of values, especially at the lower end for smoother automatic
backlight adjustments (alleviates supposed screen flicker).