ALSA: hda: Use STAC_DELL_M6_BOTH quirk for Dell Studio XPS 1645

ALSA: hda: Use STAC_DELL_M6_BOTH quirk for Dell Studio XPS 1645

commit aac78daf8f37256283f56820ae858add7139c56c upstream.

BugLink: https://launchpad.net/bugs/553002
The OR has verified that the dell-m6 model quirk is necessary for audio
to be audible by default on the Dell Studio XPS 1645.

This change is necessary for 2.6.32.11 and 2.6.33.2 alike.

Reported-by: Robert Chambers
Tested-by: Robert Chambers
Signed-off-by: Daniel T Chen <crimsun@ubuntu.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>