Add hal_vehicle_service for AIDL VHAL service.

Add selinux policy for AIDL Vehicel HAL service.
This CL mostly follows https://android-review.googlesource.com/c/platform/system/sepolicy/+/1541205/.

Test: Manually test on emulator, verify AIDL VHAL service is up and
accessible by client.
Bug: 209718034

Change-Id: Icad92e357dacea681b8539f6ebe6110a8ca8b357
6 files changed