gps: Expect build system to always have a default QCOM variant

Change-Id: Iafe2243b335e67b3a719484dc2faf0fa5ef01651
Destroy client handles after they're closed

Make sure the connection to the RPC service is shutdown and
cleaned up when loc_close() is invoked.

[mikeioannina]: Apply for AMSS 50000

Change-Id: I4f8b4d0aa3c2ff9ca5baf4ac07d31aa2e77d6721