Bug: 329367768
This is the basic SELinux setup for a HAL. Since this lives in
gs-common and not all pixel devices will have the corresponding vendor
manifest, this hal will have to be marked as optional.
Test: If this was configured incorrectly, then the build should fail
Doc: go/shared-modem-platform-cpp-backend
Change-Id: I6dd0ee3d68ff226e14e3bdffe2e828c1184c1a01