ALSA: bebob: Add support for Focusrite Saffire/SaffirePro series

This commit allows this driver to support all of models which Focusrite
produces with DM1000/BeBoB. They are:
 - Saffire
 - Saffire LE
 - SaffirePro 10 I/O
 - SaffirePro 26 I/O

This commit adds Focusrite specific operations:
1. Get source of clock
2. Get/Set sampling frequency
3. Get metering information

The driver uses these functionalities to read/write specific address by async
transaction.

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 f8e4845..605e44b 100644
--- a/sound/firewire/Kconfig
+++ b/sound/firewire/Kconfig
@@ -112,6 +112,7 @@
 	  * Terratec EWS MIC2/EWS MIC4
 	  * Terratec Aureon 7.1 Firewire
 	  * Yamaha GO44/GO46
+	  * Focusrite Saffire/Saffire LE/SaffirePro10 IO/SaffirePro26 IO
 
           To compile this driver as a module, choose M here: the module
           will be called snd-bebob.