Set only one remote adapter for RemoteViews

Previously, it is possible to have two different kinds of adapters in
the RemoteViews from partial updates. This could cause some unexpected
behaviors and performance issues. This change overwrites previous remote
adapters when there is a partial update to the RemoteViews.

Test: Presubmit
Bug: 245950570
Change-Id: I3761f52fbe77db2efa302225086314587565fdf9