qcacmn: Add function prototype for hif_get_dev_ba in header file

Function prototype for hif_get_dev_ba is c file to avoid
warning. This should be ideally added in header file. Adding this
prototype in hif.h.

Change-Id: Ic61c5b8278e6e888931721e716de74c4703ace82
CRs-Fixed: 1079655

hif/inc/hif.h

@@ -753,4 +753,6 @@ void hif_update_pipe_callback(struct hif_opaque_softc *osc,
 }
 #endif
 
+void *hif_get_dev_ba(struct hif_opaque_softc *hif_handle);
+
 #endif /* _HIF_H_ */