ALSA: ac97: Define dummy functions for snd_ac97_suspend() and resume()

For allowing the build without CONFIG_PM, add definitions of dummy
functions for snd_ac97_suspend() and snd_ac97_resume() without
CONFIG_PM, too.

Link: https://lore.kernel.org/r/20230330132847.12882-1-tiwai@suse.de
Reviewed-by: Jaroslav Kysela <perex@perex.cz>
Reviewed-by: Tasos Sahanidis <tasos@tasossah.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

include/sound/ac97_codec.h

@@ -335,6 +335,9 @@ static inline int snd_ac97_update_power(struct snd_ac97 *ac97, int reg,
 #ifdef CONFIG_PM
 void snd_ac97_suspend(struct snd_ac97 *ac97);
 void snd_ac97_resume(struct snd_ac97 *ac97);
+#else
+static inline void snd_ac97_suspend(struct snd_ac97 *ac97) {}
+static inline void snd_ac97_resume(struct snd_ac97 *ac97) {}
 #endif
 int snd_ac97_reset(struct snd_ac97 *ac97, bool try_warm, unsigned int id,
 	unsigned int id_mask);