msm8974-common: gps: Unlock the GPS

[haggertk]:
 * During bring-up of O, GPS was exhibiting different behavior from
   N -- an appropriate number of satellites would immediately lock,
   but a fix would not resolve for 30-90 seconds. Digging up this
   change from the L-era allows GPS to resolve a fix in a nominal
   amount of time.

Change-Id: If9fd67483fedee915d46f7b9d2a7e0851400de3c

gps/loc_api/libloc_api_50001/loc_eng.cpp

@@ -1387,6 +1387,7 @@ struct LocEngInit : public LocMsg {
     }
     inline virtual void proc() const {
         loc_eng_reinit(*mLocEng);
+        mLocEng->adapter->setGpsLock(1);
         // set the capabilities
         mLocEng->adapter->sendMsg(new LocEngSetCapabilities(mLocEng));
     }