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

There's a wmi event generated by dell-wmi when pressing keyboard backlight
toggle key:
[1224203.948894] dell_wmi: Unknown key with type 0x0011 and code 0x01e2 pressed

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

drivers/platform/x86/dell-wmi.c

@@ -312,6 +312,7 @@ 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, 0x02ea, { KEY_RESERVED } },
 	{ KE_IGNORE, 0x02eb, { KEY_RESERVED } },
 	{ KE_IGNORE, 0x02ec, { KEY_RESERVED } },