dell-wmi: Don't report keypresses on keybord illumination change

Keyboard illumination level changes are performed by the BIOS, so no
events should be reported on keypress. This is already done on systems
using the legacy keymap, do it also for systems that don't use it.
Signed-off-by: NGabriele Mazzotta <gabriele.mzt@gmail.com>

drivers/platform/x86/dell-wmi.c

@@ -308,11 +308,16 @@ static const struct key_entry * __init dell_wmi_prepare_new_keymap(void)
 	for (i = 0; i < hotkey_num; i++) {
 		const struct dell_bios_keymap_entry *bios_entry =
 					&dell_bios_hotkey_table->keymap[i];
-		keymap[i].type = KE_KEY;
-		keymap[i].code = bios_entry->scancode;
-		keymap[i].keycode = bios_entry->keycode < 256 ?
+		u16 keycode = bios_entry->keycode < 256 ?
 				    bios_to_linux_keycode[bios_entry->keycode] :
 				    KEY_RESERVED;
+
+		if (keycode == KEY_KBDILLUMTOGGLE)
+			keymap[i].type = KE_IGNORE;
+		else
+			keymap[i].type = KE_KEY;
+		keymap[i].code = bios_entry->scancode;
+		keymap[i].keycode = keycode;
 	}
 
 	keymap[hotkey_num].type = KE_END;