Drop binder calling identity before updating device stats

getRunningAppProcessList now returns which app is the top app. Querying
the top app has a side effect of updating device stats when the top app
changes. Drop calling identity when doing this.

Bug: 110976005
Test: ensure apps don't crash with repro steps from b/110976005
Change-Id: Ibf515ae45d73500fd97cb207565ecd8863f96da5