Allow VrCore to access VR HWC and Virtual Touchpad services

Part of the migration of VR Window Manager to VrCore, need to add
necessary permissions to VrCore to interact with dependent services.

Bug: 37542947
Test: Ran on device and verified no permission errors
Change-Id: Id6c6f6d05fc433d9b2e86114c6e9f78834bf43ec