[ALSA] Add hp-bpc model type for HP laptops

Added 'hp-bpc' model type for HP xw4400-compatible laptops.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

Documentation/sound/alsa/ALSA-Configuration.txt

@@ -798,6 +798,7 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed.
 
 	ALC262
 	  fujitsu	Fujitsu Laptop
+	  hp-bpc	HP xw4400/6400/8400/9400 laptops
 	  basic		fixed pin assignment w/o SPDIF
 	  auto		auto-config reading BIOS (default)
 

sound/pci/hda/patch_realtek.c

@@ -5774,6 +5774,7 @@ static struct hda_board_config alc262_cfg_tbl[] = {
 	{ .modelname = "fujitsu", .config = ALC262_FUJITSU },
 	{ .pci_subvendor = 0x10cf, .pci_subdevice = 0x1397,
 	  .config = ALC262_FUJITSU },
+	{ .modelname = "hp-bpc", .config = ALC262_HP_BPC },
 	{ .pci_subvendor = 0x103c, .pci_subdevice = 0x208c,
 	  .config = ALC262_HP_BPC }, /* xw4400 */
 	{ .pci_subvendor = 0x103c, .pci_subdevice = 0x3014,