[1/3] Base: Flip to Mute/Reject Call

Saving flip action value to settings container

Telephony: https://gerrit.omnirom.org/#/c/4670/
InCallUI: https://gerrit.omnirom.org/#/c/4669/

Change-Id: Ie72dda49d78b23b9bc7d8a886f6916f678c918d1