AC97 Codec Core,Intel8x0 driver,VIA82xx driver
Since there are many ac97_quirk values, the number is no longer good to
remember what it really means.  Now ac97_quirk option becomes as a string
option, and more undstandable.  For example, you can pass like
'ac97_quirk=hp_only'.  The old number is still kept and parsed for backward
compatibility.
Signed-off-by: Takashi Iwai <tiwai@suse.de>