arm64: dts: mediatek: Add mmsys #reset-cells property for mt8192

To support reset of mmsys, we include mt8192-resets.h and add
property of #reset-cells in mmsys.
Signed-off-by: Allen-KH Cheng <allen-kh.cheng@mediatek.com>
Reviewed-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Tested-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
Tested-by: Chen-Yu Tsai <wenst@chromium.org>
Link: https://lore.kernel.org/r/20220712114046.15574-4-allen-kh.cheng@mediatek.comSigned-off-by: Matthias Brugger <matthias.bgg@gmail.com>

arch/arm64/boot/dts/mediatek/mt8192.dtsi

@@ -12,6 +12,7 @@
 #include <dt-bindings/pinctrl/mt8192-pinfunc.h>
 #include <dt-bindings/phy/phy.h>
 #include <dt-bindings/power/mt8192-power.h>
+#include <dt-bindings/reset/mt8192-resets.h>
 
 / {
 	compatible = "mediatek,mt8192";
@@ -1186,6 +1187,7 @@ mmsys: syscon@14000000 {
 			compatible = "mediatek,mt8192-mmsys", "syscon";
 			reg = <0 0x14000000 0 0x1000>;
 			#clock-cells = <1>;
+			#reset-cells = <1>;
 		};
 
 		smi_common: smi@14002000 {