asus-laptop: use KEY_F13 to map "Disable Touchpad" event

The same key is used in toshiba-laptop, and there is no
reserved key for that.
Signed-off-by: NCorentin Chary <corentincj@iksaif.net>
Signed-off-by: NLen Brown <len.brown@intel.com>

drivers/platform/x86/asus-laptop.c

@@ -313,7 +313,7 @@ static struct key_entry asus_keymap[] = {
 	{KE_KEY, 0x5F, KEY_WLAN},
 	{KE_KEY, 0x60, KEY_SWITCHVIDEOMODE},
 	{KE_KEY, 0x61, KEY_SWITCHVIDEOMODE},
-	{KE_KEY, 0x6B, BTN_TOUCH}, /* Lock Mouse */
+	{KE_KEY, 0x6B, KEY_F13}, /* Lock Touchpad */
 	{KE_KEY, 0x82, KEY_CAMERA},
 	{KE_KEY, 0x8A, KEY_PROG1},
 	{KE_KEY, 0x95, KEY_MEDIA},