ALSA: sscape: Add suspend and resume support

The SoundScape ISA driver has lacked suspend and resume callbacks since
commit 277e926c9b27 ("[ALSA] sscape - Use platform_device").

A plain snd_wss resume is not sufficient for SoundScape. Resume also
needs to restore the board-specific gate-array routing, and non-VIVO
boards need to reinitialize the probe-time MIDI firmware and MIDI
control state when the MPU-401 side was enabled during probe.

That firmware reload can be handled in-kernel because
commit acd47100914b ("ALSA: sscape: convert to firmware loader framework")
moved the driver to request_firmware().

Add ISA and ISA-PnP PM callbacks, reconfigure the board on resume,
reload the non-VIVO MIDI firmware, restore the MIDI state, and then
resume the WSS codec. If MIDI firmware reload fails, keep the WSS resume
path alive and leave MIDI unavailable instead of failing the whole
device resume.

Signed-off-by: Cássio Gabriel <cassiogabrielcontato@gmail.com>
Link: https://patch.msgid.link/20260411-alsa-sscape-pm-v2-2-aeb5682e14b0@gmail.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>

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