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

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

"#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 9e72606cd2db ("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: 9e72606cd2db ("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>