dt-bindings: dma: rz-dmac: Document RZ/V2N SoC support

dt-bindings: dma: rz-dmac: Document RZ/V2N SoC support

Document the DMA controller on the Renesas RZ/V2N SoC, which is
architecturally identical to the DMAC found on the RZ/V2H(P) SoC.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://patch.msgid.link/20251125212621.267397-1-prabhakar.mahadev-lad.rj@bp.renesas.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>