Clear child animations before removal

Fixes: 36650711
Bug: 37223437
Test: None, unsupported behavior.

Prevents a case where an itemview with an android.view.animation.Animation
defers its detach. The detach can be deferred so far that RecyclerView
adds it back first, causing the child to see the invalid sequence:
attach, attach, detatch, detatch.

Change-Id: I27c75b35110fb6521ddb7ab3cf3e271128bb3069
1 file changed