ALSA: fireworks: Add MIDI interface

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

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

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 0b85ebd..36a1212 100644
--- a/sound/firewire/Kconfig
+++ b/sound/firewire/Kconfig
@@ -64,6 +64,7 @@
 config SND_FIREWORKS
 	tristate "Echo Fireworks board module support"
 	select SND_FIREWIRE_LIB
+	select SND_RAWMIDI
 	help
 	  Say Y here to include support for FireWire devices based
 	  on Echo Digital Audio Fireworks board: