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

Call Settings - add menu entry

PS2 - PS4: Code Cleanup

Base: http://gerrit.nameless-rom.org/#/c/363/
InCallUI: http://gerrit.nameless-rom.org/#/c/360/

Change-Id: Ic011c5b9e10439fc900b1302f7e07dde494b2e5b
Telephony: fix Flip to mute/silent

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

Change-Id: Ie12ff6aab6ffdaf8638e0ac39f3911f7ecb8793c