platform: arm64: thinkpad-t14s-ec: don't send KEY_KBDILLUMTOGGLE on Fn+Space

On the T14s, the EC already steps the keyboard backlight when you press
Fn+Space: off, then low, then high.

We report that change with t14s_kbd_bl_update() (brightness_hw_changed).
We then also send KEY_KBDILLUMTOGGLE.

The extra key is the problem. Desktops treat it as "please toggle the
light." GNOME calls Keyboard.Toggle() and changes the LED itself. That
fights the EC's three steps. The on-screen bar also stays empty,
because Toggle() always returns 0%.

thinkpad_acpi on x86 already skips the key when the firmware changed
the light. It only uses brightness_hw_changed. Do the same here: keep
the LED update, do not send KEY_KBDILLUMTOGGLE.

Tested on a Lenovo ThinkPad T14s Gen 6 (21N1, Snapdragon X Elite) with
GNOME. After this change the OSD bar tracks off / 50% / 100%.

Signed-off-by: David Stephenson <git@davidstephenson.net>
Reviewed-by: Sebastian Reichel <sre@kernel.org>
Reviewed-by: Hans de Goede <johannes.goede@oss.qualcomm.com>
Link: https://patch.msgid.link/20260825193556.133277-1-git@davidstephenson.net
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

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