Add global policy methods to aidl

Exposes global policy add/remove methods to aidl, allowing java system
services to use it. This will be used for tunnel mode, where security
policies must be added/updated/deleted, and logic should preferably be
in IpSecService.

Bug: 63588681
Test: Compiles
Change-Id: Ie6e99ba18ac5930273c91e81e320a2987fa17815
3 files changed