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

Call Settings - add menu entry

PS2 - PS4: Code Cleanup

Base: https://gerrit.omnirom.org/#/c/4668/
InCallUI: https://gerrit.omnirom.org/#/c/4669/

Change-Id: Ic011c5b9e10439fc900b1302f7e07dde494b2e5b
Merge "[2/3] Telephony: Flip to Mute/Reject Call" into android-4.4
merge changes from Omni 4.4 into local branch
[2/3] Services: National Data Roaming

Credits: CM

Change-Id: I1230c8e227e787f51bea0ae3756892ab4f6e5144