ALSA: wavefront: add suspend and resume support

ALSA: wavefront: add suspend and resume support

The WaveFront driver still lacks support for suspend and resume
in both the ISA and PnP driver tables.

Wire the driver into ALSA PM by storing the WSS codec pointer in the card
private data and adding shared suspend/resume callbacks. Resume cannot
simply rerun snd_wavefront_start(), because with the default fx_raw=1
setting that would reset the synth on every resume and discard uploaded
WaveFront RAM contents.

Cache wavefront.os for PM, probe the ICS2115 after resume and only run
the full reset/bootstrap path when the board comes back raw. When the
firmware is still running, refresh the software slot bookkeeping and
restore the MIDI routing state without forcing a synth reset.

Also quiesce and restart the WaveFront MIDI output timer across suspend
and resume so active rawmidi output does not race the PM transition.

This restores the card to a usable baseline after resume while preserving
uploaded samples and programs when the hardware state survives suspend.
If the board resumes raw, userspace still needs to reload custom synth
contents.

Signed-off-by: Cássio Gabriel <cassiogabrielcontato@gmail.com>
Link: https://patch.msgid.link/20260427-wavefront-pm-v1-1-9c1b6a898673@gmail.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>