DO NOT MERGE: Fix recycler view crash

The RecyclerView attempted to install it's scrollbar
every time onAttachedToWindow() was called. The second
time it was called, the recyclerview would crash
because it attempted to add it's container view to
the parent view a second time.

Bug: 179712904
Test: Manually (Remove distractionOptimized from
      showcase app, then drive and park the car)
Change-Id: I8431cc3e64683b7abba64df03ffd9275007d0171
1 file changed