Add 'vendor.' prefix to a vendor HAL service name

To prevent property name collisions between properties of system and
vendor, 'vendor.' prefix must be added to a vendor HAL service name.
You can see the details in http://go/treble-sysprop-compatibility.

Test: succeeded building and tested on a walleye device
Bug: 36796459
Change-Id: I9b51b48ae553707b9f140480b9e630c7dbbfa471