Fix TB lose focus when navigating recyclerview

 - Issue history: b/37088814 and previous workaround: ag/11747784
 - Since the previous workaround no longer works, apply new scroll
 behavior to the recyclerview when TB navigating, make sure the focusing item's
 previous/next item totally visible, then TB won't lose focus.
 video: https://drive.google.com/file/d/1KJQT9cAmm9G5yZGDZZTNnpezDbT_Rh31/view?usp=sharing

 Bug: 157007291
 Test: manually, enable TB and test the result

Change-Id: I1c4c8416d7b1849cf705db931bcd9c6e5c354719