platform/x86: dell-wmi: Ignore keyboard backlight change KBD_LED_AUTO_TOKEN

There's a wmi event generated by dell-wmi when pressing keyboard backlight
toggle key:
[1224178.355650] dell_wmi: Unknown key with type 0x0011 and code 0x01e3 pressed

This event is for notification purposes, let's ignore it.
Signed-off-by: NRhys Kidd <rhyskidd@gmail.com>
Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>

drivers/platform/x86/dell-wmi.c

@@ -313,6 +313,7 @@ static const struct key_entry dell_wmi_keymap_type_0011[] = {
 	/* Keyboard backlight level changed */
 	{ KE_IGNORE, 0x01e1, { KEY_RESERVED } },
 	{ KE_IGNORE, 0x01e2, { KEY_RESERVED } },
+	{ KE_IGNORE, 0x01e3, { KEY_RESERVED } },
 	{ KE_IGNORE, 0x02ea, { KEY_RESERVED } },
 	{ KE_IGNORE, 0x02eb, { KEY_RESERVED } },
 	{ KE_IGNORE, 0x02ec, { KEY_RESERVED } },