qcacmn: Add exit log for target_if_dbr_fill_ring

It takes long time to init DBR, so add more log to trace the time when
exit target_if_dbr_fill_ring.

Change-Id: I9ec76c92db209a44c277b0f9e1840e6dd0132559
CRs-Fixed: 3002654

target_if/direct_buf_rx/src/target_if_direct_buf_rx_main.c

@@ -1117,6 +1117,8 @@ static QDF_STATUS target_if_dbr_fill_ring(struct wlan_objmgr_pdev *pdev,
 		}
 	}
 
+	direct_buf_rx_exit();
+
 	return QDF_STATUS_SUCCESS;
 }