[3/3] Flip to Mute/Reject Call

Ported over from 4.2 implementation (thanks sasikumardr for that)

Original author of this patch was bugadani

We did just a cleanup

Provide easy mute and dismiss functionality for the phone application.

Available actions:

0: mute ringer
1: dismiss call
2: no action (default)

PS:
- fix NPE