asus-nb-wmi: set wapf=4 for ASUSTeK COMPUTER INC. X75A

BugLink: http://bugs.launchpad.net/bugs/1172151

Need to set wapf to 4 for ASUSTeK COMPUTER INC. X75A, so that
user can toggle wifi function through function key correctly.
Signed-off-by: NAceLan Kao <acelan.kao@canonical.com>
Signed-off-by: NMatthew Garrett <matthew.garrett@nebula.com>

drivers/platform/x86/asus-nb-wmi.c

@@ -171,6 +171,15 @@ static struct dmi_system_id asus_quirks[] = {
 		},
 		.driver_data = &quirk_asus_x401u,
 	},
+	{
+		.callback = dmi_matched,
+		.ident = "ASUSTeK COMPUTER INC. X75A",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
+			DMI_MATCH(DMI_PRODUCT_NAME, "X75A"),
+		},
+		.driver_data = &quirk_asus_x401u,
+	},
 	{},
 };