ALSA: fireface: add model-dependent parameter for address to receive async transaction for MIDI messages

Between former and latter models, destination address to receive
asynchronous transactions for MIDI messages is different.

This commit adds model-dependent parameter for the addresses.
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>