arm64: dts: imx8mm: specify #sound-dai-cells for SAI nodes

Add #sound-dai-cells properties to SAI nodes.
Signed-off-by: Matt Porter <mporter@konsulko.com>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8mm.dtsi

@@ -270,6 +270,7 @@ aips1: bus@30000000 {
 			ranges = <0x30000000 0x30000000 0x400000>;
 
 			sai1: sai@30010000 {
+				#sound-dai-cells = <0>;
 				compatible = "fsl,imx8mm-sai", "fsl,imx8mq-sai";
 				reg = <0x30010000 0x10000>;
 				interrupts = <GIC_SPI 95 IRQ_TYPE_LEVEL_HIGH>;
@@ -283,6 +284,7 @@ sai1: sai@30010000 {
 			};
 
 			sai2: sai@30020000 {
+				#sound-dai-cells = <0>;
 				compatible = "fsl,imx8mm-sai", "fsl,imx8mq-sai";
 				reg = <0x30020000 0x10000>;
 				interrupts = <GIC_SPI 96 IRQ_TYPE_LEVEL_HIGH>;
@@ -310,6 +312,7 @@ sai3: sai@30030000 {
 			};
 
 			sai5: sai@30050000 {
+				#sound-dai-cells = <0>;
 				compatible = "fsl,imx8mm-sai", "fsl,imx8mq-sai";
 				reg = <0x30050000 0x10000>;
 				interrupts = <GIC_SPI 90 IRQ_TYPE_LEVEL_HIGH>;
@@ -323,6 +326,7 @@ sai5: sai@30050000 {
 			};
 
 			sai6: sai@30060000 {
+				#sound-dai-cells = <0>;
 				compatible = "fsl,imx8mm-sai", "fsl,imx8mq-sai";
 				reg = <0x30060000 0x10000>;
 				interrupts = <GIC_SPI 90 IRQ_TYPE_LEVEL_HIGH>;