[ALSA] intel8x0: Add quirk for Optiplex GX270

Modules: Intel8x0 driver

This patch adds a quirk entry for the Dell Optiplex GX270, on which
the volume is set by the headphone control, not the master control.
Signed-off-by: Chris Ball <cjb@mrao.cam.ac.uk>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/intel8x0.c

@@ -1803,6 +1803,12 @@ static struct ac97_quirk ac97_quirks[] __devinitdata = {
 		.name = "Dell",	/* which model?  AD1981B*/
 		.type = AC97_TUNE_HP_ONLY
 	},
+	{
+		.subvendor = 0x1028,
+		.subdevice = 0x0151,
+		.name = "Dell Optiplex GX270",  /* AD1981B */
+		.type = AC97_TUNE_HP_ONLY
+	},
 	{
 		.subvendor = 0x1028,
 		.subdevice = 0x0163,