ALSA: gusextreme: add ISA suspend and resume callbacks

ALSA: gusextreme: add ISA suspend and resume callbacks

gusextreme still leaves its ISA PM callbacks disabled because the shared
GF1 core had no suspend and resume path suitable for PM recovery.

Resume on this board needs one extra step before the shared GF1 path can
touch the chip again: the ES1688 side must restore the GF1 routing. Split
that routing sequence into a helper, reuse it for probe and resume, reset
the ES1688 side first on resume, and then wire the driver up to the shared
GUS PM helpers.

This restores usable post-resume GF1 operation on GUS Extreme without
rerunning probe-only detection in the shared GF1 path.

Signed-off-by: Cássio Gabriel <cassiogabrielcontato@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://patch.msgid.link/20260406-b4-alsa-gus-isa-pm-v1-3-b6829a7457cd@gmail.com