sm8450-common: gps: Resolve unused parameter warnings

Change-Id: I0acef3da2c3567a28edd0a71dac89a5828f7725d

gps/location/ILocationAPI.h

@@ -445,7 +445,7 @@ public:
         @return
         No return value.
     */
-    virtual void powerStateEvent(PowerStateType powerState) {};
+    virtual void powerStateEvent(PowerStateType powerState __unused) {};
 };
 
 #endif /* ILOCATIONAPI_H */