[Search] Fix ItemInfo assignment conflict

When a BubbleTextHolder has more than one bubble text view, BubbleTextView#getParent().onItemInfoChanged is problematic as the ItemInfo associated with the last BubbleTextView will be the final ItemInfo set on parent. This is fixed by setting ItemInfo change receiver more explicitly.

Bug: 203020679
Test: Manual
Change-Id: Ia8aeead1a6151c2aa47148ba4846ae3d3ee39b73