ALSA: firewire-motu: add skeleton for Mark of the unicorn (MOTU) FireWire series

This commit adds an new driver for MOTU FireWire series. In this commit,
this driver just creates/removes card instance according to bus event.
More functionalities will be added in following commits.

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 9f00696..11a3285 100644
--- a/sound/firewire/Kconfig
+++ b/sound/firewire/Kconfig
@@ -140,4 +140,14 @@
 	 To compile this driver as a module, choose M here: the module
 	 will be called snd-firewire-tascam.
 
+config SND_FIREWIRE_MOTU
+	tristate "Mark of the unicorn FireWire series support"
+	select SND_FIREWIRE_LIB
+	select SND_HWDEP
+	help
+	 Say Y here to enable support for FireWire devices which MOTU produced:
+
+	 To compile this driver as a module, choose M here: the module
+	 will be called snd-firewire-motu.
+
 endif # SND_FIREWIRE