apn: Drop new carrier_id's again; duplicating APNs

AOSP's carrier_id doesn't seem to have the intended effect on our
telephony stack or configuration; in some cases it causes APNs to be
duplicated in the system phone settings. Drop it for now on the recently
updated networks.

Issue: FP3-A11#360
Change-Id: I89ac79616c065219b6c78c825bb31f33ade73f90
1 file changed