Don't report focusableViewAvailable on add

This reverts a part of 2ae1bf56

RecyclerView relies on the old behavior. Will un-revert this (with
targetSdk check) once we have a solution for RecyclerView

Bug: 38352147
Test: RecyclerView Focus tests now pass
Change-Id: I7b0dfda295cd75e407bbd39a948b5585f8ed6e08