acer-wmi: Add support for Aspire 1830 wlan hotkey

Signed-off-by: NSeth Forshee <seth.forshee@canonical.com>
Signed-off-by: NMatthew Garrett <mjg@redhat.com>

drivers/platform/x86/acer-wmi.c

@@ -99,6 +99,7 @@ enum acer_wmi_event_ids {
 static const struct key_entry acer_wmi_keymap[] = {
 	{KE_KEY, 0x01, {KEY_WLAN} },     /* WiFi */
 	{KE_KEY, 0x03, {KEY_WLAN} },     /* WiFi */
+	{KE_KEY, 0x04, {KEY_WLAN} },     /* WiFi */
 	{KE_KEY, 0x12, {KEY_BLUETOOTH} },	/* BT */
 	{KE_KEY, 0x21, {KEY_PROG1} },    /* Backup */
 	{KE_KEY, 0x22, {KEY_PROG2} },    /* Arcade */