ASoC: rt721: Convert to RUNTIME_PM_OPS() & co

ASoC: rt721: Convert to RUNTIME_PM_OPS() & co

Use the newer RUNTIME_PM_OPS() and SYSTEM_SLEEP_PM_OPS() macros
instead of SET_RUNTIME_PM_OPS() and SET_SYSTEM_SLEEP_PM_OPS() together
with pm_ptr(), which allows us dropping ugly __maybe_unused
attributes.

This optimizes slightly when CONFIG_PM is disabled, too.

Cc: Oder Chiou <oder_chiou@realtek.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Reviewed-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://patch.msgid.link/20250317095603.20073-42-tiwai@suse.de
Signed-off-by: Mark Brown <broonie@kernel.org>