Grant qcom_oncrpc group to system_server

 * Needed for RPC-based QC GPS

Change-Id: Idebc5f6f8e7f8c136d931d7638338d3611895d8a
GPS fixes

 * Add gps user to ZygoteInit so QC drivers can set up their sockets.
 * Fix JNI method signature of reportAGpsStatus

Change-Id: I6686ee715ff2db72edbcf4e4daad2feb1670090a