ALSA: core: Remove superfluous CONFIG_PM

Since the recent code change, the conditional build with CONFIG_PM is
calling only snd_power_sync_ref(). As a dummy function is provided
for this function, we can get rid of CONFIG_PM gracefully now.

Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Takashi Iwai <[e-mail]>

sound/core/init.c

···
 		clear_bit(card->number, snd_cards_lock);
 	}
 
-#ifdef CONFIG_PM
 	snd_power_sync_ref(card);
-#endif
 }
 EXPORT_SYMBOL(snd_card_disconnect);