The Settings ANR when allowed network type never was loaded

The root casue is the DB is empty. User flash the rom
from old android version to android S and user don't clean the
telephonyDb.
- to allow the app set network type when db's network type is empty.
- SetAkkowedNetwork reply the error response.

Bug: 193852906
Bug: 193849756
Test: atest GsmCdmaPhoneTest (pass)
Change-Id: I61703e4fbdb04180be1b03b9d6af7141f7980c5f