arm64: dts: mt8183: add GCE client property for Mediatek MUTEX

In order to allow modules with latency requirements such as MDP3
to set registers through CMDQ, add the relevant dts property.
Signed-off-by: Moudy Ho <moudy.ho@mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: CK Hu <ck.hu@mediatek.com>
Link: https://lore.kernel.org/r/20220610063424.7800-6-moudy.ho@mediatek.com
[mb: fix commit subject]
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>

arch/arm64/boot/dts/mediatek/mt8183.dtsi

@@ -1810,6 +1810,7 @@ mutex: mutex@14016000 {
 			power-domains = <&spm MT8183_POWER_DOMAIN_DISP>;
 			mediatek,gce-events = <CMDQ_EVENT_MUTEX_STREAM_DONE0>,
 					      <CMDQ_EVENT_MUTEX_STREAM_DONE1>;
+			mediatek,gce-client-reg = <&gce SUBSYS_1401XXXX 0x6000 0x1000>;
 		};
 
 		larb0: larb@14017000 {