Stats: new sepolicy for the AIDL service

Allows the AIDL IStats service to be exposed via ServiceManager
Defines IStats service client domain to be used by pixelstats_vendor

Bug: 178859845
Test: Build, flash, and aidl_stats_client
Change-Id: If41e50d0182993d0b7f8501e9147e0becf526689
4 files changed