Addressing leftover comments in ag/33040619 regarding carrier privilege
acquisition in CarrierConfigRule with the following changes:
1) Refactored CarrierPrivilegeCallback to match records using a lambda.
2) Added various helper methods to handle calls with permissions.
3) Moved wait for carrier privlege to overrideConfigAndWait.
4) Fixed acquireCarrierPrivilege to append to current cert strings
instead of overwriting them.
5) Fixed dropCarrierPrivilege to remove from current cert strings
instead of cleaning up all configs.
Flag: EXEMPT test only change
Bug: 409710349
Test: atest TetheringManagerTest
Change-Id: I1165d95775e809f1aa8905af029fb13df0d3a1a8
b4f1e46e6d