ASoC: dt-bindings: renesas,rz-ssi: Remove DMA description

Remove the DMA description, as it duplicates content from
../dma/renesas,rz-dma.yaml. Additionally, remove the MID/RID examples
mentioned in the dropped description (this information is already
documented in the hardware manual).

Suggested-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Link: https://patch.msgid.link/20241210170953.2936724-19-claudiu.beznea.uj@bp.renesas.com


Signed-off-by: Mark Brown <broonie@kernel.org>