ALSA: atmel: Convert to DEFINE_SIMPLE_DEV_PM_OPS() macro

Use the newer DEFINE_SIMPLE_DEV_PM_OPS() macro instead of
SIMPLE_DEV_PM_OPS() together with pm_ptr(), which makes
CONFIG_PM_SLEEP ifdefs superfluous.

Merely a cleanup, there should be no actual code change.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://patch.msgid.link/20250313170731.26943-3-tiwai@suse.de