Mark VvmSimStateTracker as system user only

The Phone object visual voicemail depends on is only available to the
primary(system) user. This CL prevent the receiver to be invoked on
secondary users.

Bug: 34022180
Fixes: 34022180
Test: Manually remove and insert the SIM on a device with secondary
      users.

Change-Id: I825d49b8ffac8bc71b5c92381ed73dd206574ef5
1 file changed