Loud Technologies Tapco Link.FireWire 4x6 is identified as the model
with OXFW970 ASIC.

This commit adds explicit entry for the model.
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Link: https://lore.kernel.org/r/20210518084557.102681-6-o-takashi@sakamocchi.jpSigned-off-by: Takashi Iwai <tiwai@suse.de>