ALSA: bebob: Add proc interface for debugging purpose

This commit adds proc interface to get these information for debugging:
 - firmware information
 - stream formation
 - current clock source and sampling rate

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/firewire/bebob/bebob.c

@@ -162,6 +162,8 @@ bebob_probe(struct fw_unit *unit,
 	if (err < 0)
 		goto error;
 
+	snd_bebob_proc_init(bebob);
+
 	err = snd_bebob_stream_init_duplex(bebob);
 	if (err < 0)
 		goto error;