bluez5: add a property to select default profile

src/daemon/media-session.d/bluez-monitor.conf

@@ -59,6 +59,10 @@ rules = [
                 # AAC variable bitrate mode
                 # Available values: 0 (cbr, default), 1-5 (quality level)
                 #bluez5.a2dp.aac.bitratemode  = 0
+
+                # Profile connected first
+                # Available values: a2dp-sink (default), headset-head-unit
+                #device.profile  = headset-head-unit
             }
         }
     }