ALSA: firewire-motu: use table-based calculation of packet formats for proc

This commit uses table-based calculation of packet formats for proc
nodes.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Link: https://lore.kernel.org/r/20200519111641.123211-10-o-takashi@sakamocchi.jp


Signed-off-by: Takashi Iwai <tiwai@suse.de>