Use FLAG_UPDATED_SYSTEM_APP

Use FLAG_UPDATED_SYSTEM_APP find if an app is updated system app
instead of MATCH_FACTORY_ONLY

Bug: 148308979
Test: Unit test for CarrierAppUtils and system test to
      verify fi is not getting uninstalled
Merged-In: I1991e98bb1edb7d0628a7011df7488fbf5de3579
Change-Id: I1991e98bb1edb7d0628a7011df7488fbf5de3579