arm64: dts: rockchip: drop rockchip,trcm-sync-tx-only from rk3588 i2s

The rockchip,trcm-sync-tx-only property is at this time only documented
for the tdm variant of Rockchip i2s controllers.

While there was a series [0] adding code and binding for the property,
it doesn't seem to have gone forward back in 2021.

So for now fix the devicetree check by removing the property from rk3588
i2s controllers until support for it gets merged.

[0] https://patchwork.kernel.org/project/linux-rockchip/patch/1629796734-4243-5-git-send-email-sugar.zhang@rock-chips.com/

Fixes: 8ae112a5 ("arm64: dts: rockchip: Add rk3588s I2S nodes")
Cc: Sugar Zhang <sugar.zhang@rock-chips.com>
Cc: Cristian Ciocaltea <cristian.ciocaltea@collabora.com>
Signed-off-by: Heiko Stuebner <heiko.stuebner@cherry.de>
Reviewed-by: Quentin Schulz <quentin.schulz@theobroma-systems.com>
Link: https://lore.kernel.org/r/20240227164659.705271-2-heiko@sntech.deSigned-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm64/boot/dts/rockchip/rk3588s.dtsi

@@ -1710,7 +1710,6 @@ i2s2_2ch: i2s@fe490000 {
 		dmas = <&dmac1 0>, <&dmac1 1>;
 		dma-names = "tx", "rx";
 		power-domains = <&power RK3588_PD_AUDIO>;
-		rockchip,trcm-sync-tx-only;
 		pinctrl-names = "default";
 		pinctrl-0 = <&i2s2m1_lrck
 			     &i2s2m1_sclk
@@ -1731,7 +1730,6 @@ i2s3_2ch: i2s@fe4a0000 {
 		dmas = <&dmac1 2>, <&dmac1 3>;
 		dma-names = "tx", "rx";
 		power-domains = <&power RK3588_PD_AUDIO>;
-		rockchip,trcm-sync-tx-only;
 		pinctrl-names = "default";
 		pinctrl-0 = <&i2s3_lrck
 			     &i2s3_sclk