tree 01e9792080c37b4a3d734c1ec80e7232c9ca3f30
parent 37bd9aabfaf6d396ab8a32fddee3142681bf6d16
author chen xu <fionaxu@google.com> 1541380620 -0800
committer chen xu <fionaxu@google.com> 1542051516 -0800

parent carrier id

The parent-child relationship can be used to further differentiate a
single carrier by different networks, by prepaid v.s. postpaid
or even by 4G v.s. 3G plan. parent carrier id it's an optional field.
A carrier id with a valid parent_carrier_id is considered fine-grained carrier id,
will not be returned as API getSimCarrierId but will be returned as
new API getSimPreciseCarrierId.

Bug: 110559381
Change-Id: Ib5b8e2a2e14412c2a3f178f80c24d67a86b0036f