Fallback to NUMERIC when CARRIER_ID is unknown

For some subscription, the carrier id is unknown (-1), which cause the
inserted APN not be displayed.

Fallback to NUMERIC when CARRIER_ID is unknown to fix this issue.

Fix: 324394199
Test: manual with esim test profile - carrier id -1
Test: unit tests
Change-Id: Ic63a3e0c9ab37c8bdf86a2c7155b08778f05deff