[2/3] Telephony: Flip to Mute/Reject Call

Call Settings - add menu entry.

PS2 - PS4: Code Cleanup

Change-Id: I55f8bbf068ceeb923a345421c8b5cdf10414f077
Telephony: fix Flip to Mute/Silent

maybe fix http://jira.omnirom.org/browse/OMNI-412

Change-Id: Ia19dd791982e933eb2f648dc0daef9bfa6bb84fa