ALSA: hda - Avoid unnecessary verbs write in snd_hda_activate_path()

... by using snd_Hda_codec_update_cache() instead of *_write_cache().
Since all path elements should have been updated by this function,
we are safe to assume that the cache contents are consistent.

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