arm64: dts: renesas: r8a779g0: Tidy up sound DT settings

arm64: dts: renesas: r8a779g0: Tidy up sound DT settings

R-Car V4H (R8A779G0) supports only 1 AUDIO_CLKOUT and 1 SSI,
thus, #clock-cells / #sound-dai-cells are both fixed to zero.
(#sound-dai-cells is needed for Simple-Audio-Card, but not needed for
Audio-Graph-Card).  Fix this up.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/87frt3kxew.wl-kuninori.morimoto.gx@renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>