[ALSA] snd_hda_intel 3stack mode for ASUS P5P-L2

I have ASUS P5PL2 motherboard and it's embedded sound card requires
the following patch which sets '3stack' model to operate properly:
00:1b.0 0403: 8086:27d8 (rev 01)
        Subsystem: 1043:817f
        Flags: bus master, fast devsel, latency 0, IRQ 177
        Memory at dfdf8000 (64-bit, non-prefetchable) [size=16K]
        Capabilities: [50] Power Management version 2
        Capabilities: [60] Message Signalled Interrupts: 64bit+
Queue=0/0 Enable-
        Capabilities: [70] Express Unknown type IRQ 0

Signed-off-by: Nickolay V. Shmyrev <nshmyrev@yandex.ru>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

sound/pci/hda/patch_analog.c

@@ -794,6 +794,8 @@ static struct hda_board_config ad1986a_cfg_tbl[] = {
 	{ .modelname = "3stack",	.config = AD1986A_3STACK },
 	{ .pci_subvendor = 0x10de, .pci_subdevice = 0xcb84,
 	  .config = AD1986A_3STACK }, /* ASUS A8N-VM CSM */
+	{ .pci_subvendor = 0x1043, .pci_subdevice = 0x817f,
+	  .config = AD1986A_3STACK }, /* ASUS P5P-L2 */
 	{ .pci_subvendor = 0x1043, .pci_subdevice = 0x81b3,
 	  .config = AD1986A_3STACK }, /* ASUS P5RD2-VM / P5GPL-X SE */
 	{ .pci_subvendor = 0x1043, .pci_subdevice = 0x81cb,