dt-bindings: display: mediatek, mutex: Fix mediatek, gce-events type

The mediatek,gce-events property needs as value an array of uint32
corresponding to the CMDQ events to listen to, and not any phandle.

Fixes: 4ed545e7 ("dt-bindings: display: mediatek: disp: split each block to individual yaml")
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: jason-jh.lin <jason-jh.lin@mediatek.com>
Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220309134702.9942-3-jason-jh.lin@mediatek.com

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

@@ -58,7 +58,7 @@ properties:
       The event id which is mapping to the specific hardware event signal
       to gce. The event id is defined in the gce header
       include/dt-bindings/gce/<chip>-gce.h of each chips.
-    $ref: /schemas/types.yaml#/definitions/phandle-array
+    $ref: /schemas/types.yaml#/definitions/uint32-array
 
 required:
   - compatible