gps: Add permissions for gps driver for open/read pps device

DR_SYNC pulse from GSS is routed to pps driver and gps driver
need to read the pps device to get kernel timestamp of DR_SYNC
signal.

Change-Id: If561054752f4476f0e8608d15b5c51c63345e76d
CRs-Fixed: 942070
1 file changed