In the original design, we only set title description for view holder, this is wrong. It causes talkback can't speak subtext info. Currently, we set the title content description in the title view directly, so talkback can say the title and subtext now when talkback focus on an app view. Test: Talkback speaks full information for an app entry Fix: 177873163 Change-Id: I94996d596a85cc2813ed1b10cdd4ed2bee62f4a9