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
This macro creates the necessary neverallow to assert the
hal_can_*_{client,server} attribute has exclusive ownership of
the service.
Bug: 176180039
Test: build/TH
Change-Id: I876b50e4184ef787117d5ca67c7fbd522d82687c