PCI: expose SMBus on Asus notebook A6L

Addition of one unknown subsystem identifier to the quirks handler for
chipset i82855GM_HB on notebook Asus A6L. This exposes the otherwise
hidden SMBus controller within the south bridge ICH4-M.

Signed-off-by: Mats Erik Andersson <mats.andersson@gisladisker.se>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 3067673..a778c84 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -1133,6 +1133,7 @@
 			switch (dev->subsystem_device) {
 			case 0x1751: /* M2N notebook */
 			case 0x1821: /* M5N notebook */
+			case 0x1897: /* A6L notebook */
 				asus_hides_smbus = 1;
 			}
 		else if (dev->device == PCI_DEVICE_ID_INTEL_82855PM_HB)