AudioService: don't launch music player while in call

If the option to launch the music player when inserting headphones is
enabled, do not launch the music player if the user is in a call, or
receiving one, or making one.

Change-Id: I1e1d173fdd246154299b77227f0e1cbed449246b
Signed-off-by: Roman Birg <roman@cyngn.com>