ALSA: hda - Add snd_hda_check_power_state() helper function

... for small refactoring.

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

diff --cc sound/pci/hda/hda_codec.c
Simple merge

diff --cc sound/pci/hda/hda_local.h
Simple merge

diff --cc sound/pci/hda/patch_via.c
Simple merge