dt-bindings: cros-ec: Remove google,cros-kbd-led-backlight

After applying 4c03a44 ("arm64: dts: mediatek: mt8195-cherry: Remove
keyboard-backlight node"), there are no users for using the OF match.
Instead, the device is added via drivers/mfd/cros_ec_dev.c by
970c3a6 ("mfd: cros_ec: Register keyboard backlight subdevice").

Remove the DT bindings.

Acked-by: Rob Herring (Arm) <[email protected]>
Acked-by: Lee Jones <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Tzung-Bi Shih <[email protected]>

Author: Tzung-Bi Shih

Documentation/devicetree/bindings/chrome/google,cros-kbd-led-backlight.yaml

@@ -108,9 +108,6 @@ properties:
   pwm:
     $ref: /schemas/pwm/google,cros-ec-pwm.yaml#
 
-  kbd-led-backlight:
-    $ref: /schemas/chrome/google,cros-kbd-led-backlight.yaml#
-
   keyboard-controller:
     $ref: /schemas/input/google,cros-ec-keyb.yaml#