Revert "[3/3] InCallUI: allow disabling non intrusive incall ui"

This reverts commit 858c5f8d28e37c46eabdf10d98da13943121429c.
Revert "[1/2] InCall: Add a non-intrusive dialog for incoming calls"

This reverts commit 0c50f861d4b1cb58d23fee25d9e56b29c5c089da.