ALSA: hda: Add snd_hdac_ext_bus_link_at() helper

This patch exposes a new helper to directly retrieve the link from the
codec address, and makes use of this helper when retrieving the link
from the codec name.

Signed-off-by: Cezary Rojewski <cezary.rojewski@intel.com>
Link: https://lore.kernel.org/r/20220214101404.4074026-2-cezary.rojewski@intel.com


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