Remove CircularRevealActivity

Replace CircularRevealActivity with a fragment that is tied to
the lifecycle of InCallActivity so that InCallActivity is the
only activity that is involved in the outgoing call process.

Simplify some of the intent creation logic that is used to launch
InCallActivity since we no longer need some of the flags that were
currently provided via various method overloads in
InCallPresenter.getAnimationIntent and getInCallIntent.

To further simplify this CL, a very rudimentary approach is taken to
track the state where we are starting up the UI but haven't received
a call from Telecom yet. This is done by a boolean flag set on the
InCallPresenter: mBoundAndWaitingForOutgoingCall.

Further changes will build upon and improve this.

Also set most elements inside primary_call_info.xml to
visibility: GONE by default to fix some animation jank where a
empty but not GONE view would continue to take up space.

Change-Id: Ic70857685680af6868d4b2153d942d73eef3ca56