ALSA: hda: Move common codec driver into sound/hda/common directory

The snd-hda-codec module contains the most of common code used by both
HD-audio controller and codec drivers, and it's basically independent
from PCI.  Let's move the code to sound/hda/common directory as a part
of code reorganization.

The hda_ prefix is dropped from the most of file names as it's rather
superfluous.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://patch.msgid.link/20250709160434.1859-4-tiwai@suse.de