ALSA: bebob: Add MIDI interface

This commit adds a functionality to capture/playback MIDI messages.

When no AMDTP streams are running, this module starts AMDTP stream at current
sampling rate for MIDI substream.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/firewire/Kconfig b/sound/firewire/Kconfig
index 5539baa..708d3c8 100644
--- a/sound/firewire/Kconfig
+++ b/sound/firewire/Kconfig
@@ -82,6 +82,7 @@
 config SND_BEBOB
 	tristate "BridgeCo DM1000/DM1100/DM1500 with BeBoB firmware"
 	select SND_FIREWIRE_LIB
+	select SND_RAWMIDI
         help
 	 Say Y here to include support for FireWire devices based
 	 on BridgeCo DM1000/DM1100/DM1500 with BeBoB firmware: