Handle CALL_IS_WAITING MO notification.

Make that piece of information available to InCallUI so that it can
display it.

Change-Id: Id429824d3af85cf16290b8286b87903c9dc02655
Merge "Handle CALL_IS_WAITING MO notification." into cm-11.0
[2/3] Telephony: allow disabling non intrusive incall ui

Change-Id: I54c07211dc121117543ccb8a4799efa491e5a469
Telephony: Allow enabling call recording (3/3)

Change-Id: If965a4e2f2d943f866a7aa14503008dd9f234450