ARM: dts: rockchip: move rk3036 i2s sound-dail-cells into soc dtsi

The Rockchip i2s controller always only has one output connection
hence #sound-dai-cells is always 0. Therefore define it in the soc
dtsi itself instead of in individual boards.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm/boot/dts/rk3036-kylin.dts

@@ -310,7 +310,6 @@ rt5616: rt5616@1b {
 };
 
 &i2s {
-	#sound-dai-cells = <0>;
 	status = "okay";
 };
 

arch/arm/boot/dts/rk3036.dtsi

@@ -289,6 +289,7 @@ i2s: i2s@10220000 {
 		dma-names = "tx", "rx";
 		pinctrl-names = "default";
 		pinctrl-0 = <&i2s_bus>;
+		#sound-dai-cells = <0>;
 		status = "disabled";
 	};