arm64: dts: renesas: hihope: Drop #sound-dai-cells

[ Upstream commit 9cc926e3fab42dd292219796cfc94e41f4ab749d ]

"#sound-dai-cells" is required if the board is using "simple-card".
However, the HiHope board uses "audio-graph", thus remove the unneeded
`#sound-dai-cells`.

Commit 9e72606cd2 ("arm64: dts: renesas: #sound-dai-cells is used when
simple-card") updated the comment regarding usage of "#sound-dai-cells"
in the SoC DTSI but missed to remove "#sound-dai-cells" from board DTS
files.

Fixes: 9e72606cd2 ("arm64: dts: renesas: #sound-dai-cells is used when simple-card")
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/20241010135332.710648-1-prabhakar.mahadev-lad.rj@bp.renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Sasha Levin <sashal@kernel.org>

arch/arm64/boot/dts/renesas/hihope-rev2.dtsi

@@ -69,9 +69,6 @@
 
 	status = "okay";
 
-	/* Single DAI */
-	#sound-dai-cells = <0>;
-
 	rsnd_port: port {
 		rsnd_endpoint: endpoint {
 			remote-endpoint = <&dw_hdmi0_snd_in>;

arch/arm64/boot/dts/renesas/hihope-rev4.dtsi

@@ -84,9 +84,6 @@
 	pinctrl-names = "default";
 	status = "okay";
 
-	/* Single DAI */
-	#sound-dai-cells = <0>;
-
 	/* audio_clkout0/1/2/3 */
 	#clock-cells = <1>;
 	clock-frequency = <12288000 11289600>;