acer-wmi: Add DMI match for mail LED on Acer TravelMate 4200 series

The TM4200 series use the same method as the TM2490 series to control the
mail LED, so add a DMI based quirk for these laptops.

Signed-off-by: Carlos Corbacho <carlos@strangeworlds.co.uk>
Signed-off-by: Len Brown <len.brown@intel.com>

drivers/misc/acer-wmi.c

@@ -271,6 +271,15 @@ static struct dmi_system_id acer_quirks[] = {
 		},
 		.driver_data = &quirk_acer_travelmate_2490,
 	},
+	{
+		.callback = dmi_matched,
+		.ident = "Acer TravelMate 4200",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 4200"),
+		},
+		.driver_data = &quirk_acer_travelmate_2490,
+	},
 	{
 		.callback = dmi_matched,
 		.ident = "Medion MD 98300",