ARM: dts: rockchip: add #sound-dai-cells to hdmi node on rk3128

'#sound-dai-cells' is required to properly interpret
the list of DAI specified in the 'sound-dai' property,
so add them to the 'hdmi' node for 'rk3128.dtsi'.
Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Link: https://lore.kernel.org/r/9d0fabb0-70b0-4b4b-ac7c-389b1c7afe20@gmail.comSigned-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm/boot/dts/rockchip/rk3128.dtsi

@@ -566,6 +566,7 @@ hdmi: hdmi@20034000 {
 		pinctrl-names = "default";
 		pinctrl-0 = <&hdmii2c_xfer &hdmi_hpd &hdmi_cec>;
 		power-domains = <&power RK3128_PD_VIO>;
+		#sound-dai-cells = <0>;
 		status = "disabled";
 
 		ports {