Add ArcService AIDL in Vold

This is needed to allow ARC++ Vold to interact with ArcBridgeService
through SystemServer.

Bug: 64500663
Test: Compiled, tested on device + cts in master-arc-dev (ag/3488659)
Change-Id: I3b05b0f456ec99be9163877a2d83cdbf2bb94991
1 file changed