Although MOTU Traveler supports AES/EBU source for sampling clock,
current implementation of driver doesn't code it.

This commit adds support for AES/EBU source in protocol version 2.
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Link: https://lore.kernel.org/r/20210623075941.72562-4-o-takashi@sakamocchi.jpSigned-off-by: Takashi Iwai <tiwai@suse.de>