[ALSA] Add model entry for Clevo m665n laptop

Added the proper model entry for Clevo m665n laptop with ALC880 codec.
Also, added a model string 'clevo' to enable the clevo-type model option.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

Documentation/sound/alsa/ALSA-Configuration.txt

@@ -783,6 +783,7 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed.
 	  F1734		2-jack
 	  lg		LG laptop (m1 express dual)
 	  lg-lw		LG LW20 laptop
+	  clevo		Clevo laptops (m520G, m665n)
 	  test		for testing/debugging purpose, almost all controls can be
 			adjusted.  Appearing only when compiled with
 			$CONFIG_SND_DEBUG=y

sound/pci/hda/patch_realtek.c

@@ -2156,8 +2156,13 @@ static struct hda_board_config alc880_cfg_tbl[] = {
 	{ .modelname = "3stack-digout", .config = ALC880_3ST_DIG },
 	{ .pci_subvendor = 0x8086, .pci_subdevice = 0xe308, .config = ALC880_3ST_DIG },
 	{ .pci_subvendor = 0x1025, .pci_subdevice = 0x0070, .config = ALC880_3ST_DIG },
-	/* Clevo m520G NB */
-	{ .pci_subvendor = 0x1558, .pci_subdevice = 0x0520, .config = ALC880_CLEVO },
+
+	/* Clevo laptops */
+	{ .modelname = "clevo", .config = ALC880_CLEVO },
+	{ .pci_subvendor = 0x1558, .pci_subdevice = 0x0520,
+	  .config = ALC880_CLEVO }, /* Clevo m520G NB */
+	{ .pci_subvendor = 0x1558, .pci_subdevice = 0x0660,
+	  .config = ALC880_CLEVO }, /* Clevo m665n */
 
 	/* Back 3 jack plus 1 SPDIF out jack, front 2 jack (Internal add Aux-In)*/
 	{ .pci_subvendor = 0x8086, .pci_subdevice = 0xe305, .config = ALC880_3ST_DIG },