ALSA: echoaudio: Simplify with DEFINE_SIMPLE_DEV_PM_OPS()

Use the new DEFINE_SIMPLE_DEV_PM_OPS() instead of SIMPLE_DEV_PM_OPS()
for code-simplification.  We need no longer CONFIG_PM_SLEEP ifdefs.

This ends up with the allocation of firmware caches if it's not really
used without CONFIG_PM, but the code simplification should justify the
cost.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://lore.kernel.org/r/20240207155140.18238-21-tiwai@suse.de


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