Don't drop carrier app cache unnecessarily

Don't rebuild the carrier-app or system-bundled app set caches in
AppStandbyController in response to component enable/disable state
changes: they can only change when whole-package state changes occur.

Bug: 175071071
Bug: 155570933
Test: boot & run normally, swap SIM, etc.
Change-Id: I345d339a211b601e5f65eb35fa66390a4a582964