arm64: dts: mediatek: mt6795: Add support for the CMDQ/GCE mailbox

In preparation for adding multimedia blocks, add the CMDQ/GCE mailbox.
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20230412112739.160376-17-angelogioacchino.delregno@collabora.comSigned-off-by: Matthias Brugger <matthias.bgg@gmail.com>

arch/arm64/boot/dts/mediatek/mt6795.dtsi

@@ -7,6 +7,7 @@
 #include <dt-bindings/interrupt-controller/irq.h>
 #include <dt-bindings/interrupt-controller/arm-gic.h>
 #include <dt-bindings/clock/mediatek,mt6795-clk.h>
+#include <dt-bindings/gce/mediatek,mt6795-gce.h>
 #include <dt-bindings/pinctrl/mt6795-pinfunc.h>
 #include <dt-bindings/power/mt6795-power.h>
 #include <dt-bindings/reset/mediatek,mt6795-resets.h>
@@ -401,6 +402,15 @@ fhctl: clock-controller@10209f00 {
 			status = "disabled";
 		};
 
+		gce: mailbox@10212000 {
+			compatible = "mediatek,mt6795-gce", "mediatek,mt8173-gce";
+			reg = <0 0x10212000 0 0x1000>;
+			interrupts = <GIC_SPI 143 IRQ_TYPE_LEVEL_LOW>;
+			clocks = <&infracfg CLK_INFRA_GCE>;
+			clock-names = "gce";
+			#mbox-cells = <2>;
+		};
+
 		gic: interrupt-controller@10221000 {
 			compatible = "arm,gic-400";
 			#interrupt-cells = <3>;