VVM filtering should be done after carrier sms app.

Carrier app can be signed by a certificate present on SIM (app
will show up in CarrierPackage), or it can be a system app.
VVM filtering should not be between these 2; should be either
before them, or after, and we've decided to go with after for now.

Bug: 29899506
Change-Id: I2dfe0dce4e9d7f207b53275d594a6119c1224dba