[3/3] InCallUI: Flip to Mute/Reject Call

Actual Logic for this functionality

PS2- Remove unwanted space

Base: http://gerrit.nameless-rom.org/#/c/362/
Telephony: http://gerrit.nameless-rom.org/#/c/363/

Change-Id: Ia10df0045e9919c6b7efc97857abaeba246c365d