ALSA: firewire: Remove unused cmp_connection_update

cmp_connection_update() has been unused since 2019's commit
7eb7b18e ("ALSA: fireworks: code refactoring for bus reset handler")

Remove it.

Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
Reviewed-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://patch.msgid.link/20241009003653.254753-1-linux@treblig.org