ALSA: ump: Update legacy substream names upon FB info update

The legacy rawmidi substreams should be updated when UMP FB Info or
UMP FB Name are received, too.

Link: https://patch.msgid.link/20241129094546.32119-4-tiwai@suse.de


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