Update REQUEST_PEERS message with calling package

The service enforces location permissions on the caller,
verifies the calling package is registered with the uid.

BUG: 30760540
Test: Unit tests, P2p scan to get peer list and
       establishing a Wifi Direct connection
Change-Id: Ia0eb466a370a00c0264944871ce348841a17abc3
Merged-In: Ia0eb466a370a00c0264944871ce348841a17abc3