dt-bindings: soc: mediatek: move out common module from display folder

In order to share the same hardware information with MDP3,
change the MUTEX dt-binding to the path "soc/mediatek".
Signed-off-by: Moudy Ho <moudy.ho@mediatek.com>
Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20220610063424.7800-4-moudy.ho@mediatek.comSigned-off-by: Matthias Brugger <matthias.bgg@gmail.com>

Documentation/devicetree/bindings/display/mediatek/mediatek,mutex.yaml → Documentation/devicetree/bindings/soc/mediatek/mediatek,mutex.yaml

 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 %YAML 1.2
 ---
-$id: http://devicetree.org/schemas/display/mediatek/mediatek,mutex.yaml#
+$id: http://devicetree.org/schemas/soc/mediatek/mediatek,mutex.yaml#
 $schema: http://devicetree.org/meta-schemas/core.yaml#
 
 title: Mediatek mutex