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

This reverts commit 0e77f6d085b129b953c92f3243ad12bafd1bb392.
Revert "[1/2] InCall: Add a non-intrusive dialog for incoming calls"

This reverts commit 76b65d847ccbaec05c05792ac17b9b70117d6fb2.