platform/x86: asus-nb-wmi: Add keymap for display toggle

On the Asus Zenbook 14 (UX3405MA), the Fn+F7 key combination emits
WMI code 0x2d, which was previously unmapped.

Map this code to KEY_DISPLAYTOGGLE. This matches the behavior of the
display toggle/projector mode key found on other Asus laptops, allowing
userspace to handle multi-monitor switching or screen toggling.

Tested on ASUS Zenbook 14 UX3405MA.

Signed-off-by: Tim Wassink <timwassink.dev@gmail.com>
Reviewed-by: Denis Benato <benato.denis96@gmail.com>
Link: https://patch.msgid.link/20251221181724.19927-1-timwassink.dev@gmail.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

Author: timW188

drivers/platform/x86/asus-nb-wmi.c

@@ -580,6 +580,7 @@ static const struct key_entry asus_nb_wmi_keymap[] = {
 	{ KE_KEY, 0x2a, { KEY_SELECTIVE_SCREENSHOT } },
 	{ KE_IGNORE, 0x2b, }, /* PrintScreen (also send via PS/2) on newer models */
 	{ KE_IGNORE, 0x2c, }, /* CapsLock (also send via PS/2) on newer models */
+	{ KE_KEY, 0x2d, { KEY_DISPLAYTOGGLE } },
 	{ KE_KEY, 0x30, { KEY_VOLUMEUP } },
 	{ KE_KEY, 0x31, { KEY_VOLUMEDOWN } },
 	{ KE_KEY, 0x32, { KEY_MUTE } },