alsa: add option to disable mmap access mode

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

@@ -56,6 +56,7 @@ rules = [
                 #audio.position = 		"FL,FR"
                 #api.alsa.period-size =         1024
                 #api.alsa.headroom =            0
+                #api.alsa.disable-mmap =        false
             }
         }
     }