Make sure ACTION_HOVER_EXIT is never sent to a
ViewGroup more than once.
While processing ACTION_HOVER_MOVE during exiting
a hover target never send it a ACTION_HOVER_ENTER.
Test: android.view.cts.HoverTest
Bug: 32071138
Bug: 32071098
Change-Id: Ibc1809137907176437a3a5a4ea14b00f1c629b58