dt-bindings: clock: mediatek: Add #reset-cells property for MT8188

The '#reset-cells' property is permitted for some of the MT8188
clock controllers, but not listed as a valid property.

Fixes: 9a5cd59640ac ("dt-bindings: clock: mediatek: Add SMI LARBs reset for MT8188")
Reviewed-by: AngeloGioacchino Del Regno <[e-mail]>
Signed-off-by: Julien Massot <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Acked-by: Conor Dooley <[e-mail]>
Signed-off-by: Stephen Boyd <[e-mail]>

Documentation/devicetree/bindings/clock/mediatek,mt8188-clock.yaml

···
   '#clock-cells':
     const: 1
 
+  '#reset-cells':
+    const: 1
+
 required:
   - compatible
   - reg