ALSA: hda - Avoid quirk for HP dc5750

The present quirk for HP dc5750 seems broken and maps the pins wrongly.
Since the auto-parser works well for this device, set the default entry
to use model=auto.

Reference: Novell bnc#552154
	https://bugzilla.novell.com/show_bug.cgi?id=552154



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