AccessibilityNodeInfos node properly cached.

1. AccessibilityNodeInfo were not cloned when cached
   and obtained from the cache. This was causing a
   problem when the client calls #recycle() as he
   should since this results in wiping the data of
   the cached node info.

bug:6026952

Change-Id: I5807b09d95ef6f310327192ff91f036adf337e33