arm64: dts: rockchip: remove #sound-dai-cells from &i2s1 node of rk3399-pinebook-pro.dts

The '#sound-dai-cells' property is already defined in rk3399.dtsi
at the 'i2s1' node, so remove it from the '&i2s1' node in
'rk3399-pinebook-pro.dts'.
Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Link: https://lore.kernel.org/r/20200424155600.24254-1-jbx6244@gmail.comSigned-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm64/boot/dts/rockchip/rk3399-pinebook-pro.dts

@@ -743,7 +743,6 @@ usbc_dp: endpoint {
 };
 
 &i2s1 {
-	#sound-dai-cells = <0>;
 	pinctrl-names = "default";
 	pinctrl-0 = <&i2s_8ch_mclk_gpio>, <&i2s1_2ch_bus>;
 	rockchip,capture-channels = <8>;