ALSA: rawmidi: Add a proper disconnect handling

The rawmidi core detaches only exposed devices at disconnection, but
it doesn't deal with the pending bytes or gate the further unexpected
accesses, leaving naively to each driver dealing with such situations.

Let's try to restrict it in the core side for more safety: introduce
the disconnected flag to each substream, set it at disconnection call,
then trigger down & cancel the pending event work.

Link: https://patch.msgid.link/20260903150816.1917831-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>

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