arm64: dts: rockchip: remove properties from spdif node RK3399 Excavator

An expermental test with the command below gives this error:

arch/arm64/boot/dts/rockchip/rk3399-sapphire-excavator.dt.yaml:
spdif@ff870000:
'i2c-scl-falling-time-ns', 'i2c-scl-rising-time-ns', 'power-domains'
do not match any of the regexes: 'pinctrl-[0-9]+'

'i2c-scl-falling-time-ns', 'i2c-scl-rising-time-ns'
are not valid properties for 'spdif' nodes, so remove them.

make ARCH=arm64 dtbs_check
DT_SCHEMA_FILES=Documentation/devicetree/bindings/sound/rockchip-spdif.yaml

Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Link: https://lore.kernel.org/r/20200312172240.21362-1-jbx6244@gmail.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm64/boot/dts/rockchip/rk3399-sapphire-excavator.dts

@@ -230,7 +230,5 @@
 };
 
 &spdif {
-	i2c-scl-rising-time-ns = <450>;
-	i2c-scl-falling-time-ns = <15>;
 	status = "okay";
 };