dell-laptop: Add another Dell laptop to the DMI whitelist

The Latitude C640 has another variation of dell in its DMI vendor entry.
Add it to the whitelist in order to enjoy the sweet fruits of software
backlight toggling.
Signed-off-by: NErik Andren <erik.andren@gmail.com>

drivers/platform/x86/dell-laptop.c

@@ -81,6 +81,13 @@ static const struct dmi_system_id __initdata dell_device_table[] = {
 			DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
 		},
 	},
+	{
+		.ident = "Dell Computer Corporation",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
+			DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
+		},
+	},
 	{ }
 };
 
@@ -609,3 +616,4 @@ MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
 MODULE_DESCRIPTION("Dell laptop driver");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("dmi:*svnDellInc.:*:ct8:*");
+MODULE_ALIAS("dmi:*svnDellComputerCorporation.:*:ct8:*");