DT: dmaengine: renesas,rcar-dmac: document R8A77980 support

Renesas  R-Car V3H SoC has the R-Car gen3 compatible DMA controllers.
Document R-Car V3H (also known as R8A77980) SoC bindings.

Signed-off-by: Sergei Shtylyov <[email protected]>
Reviewed-by: Geert Uytterhoeven <[email protected]>
Reviewed-by: Simon Horman <[email protected]>
Reviewed-by: Rob Herring <[email protected]>
Signed-off-by: Vinod Koul <[email protected]>

Author: Sergei Shtylyov

Documentation/devicetree/bindings/dma/renesas,rcar-dmac.txt

@@ -26,6 +26,7 @@ Required Properties:
 		- "renesas,dmac-r8a7795" (R-Car H3)
 		- "renesas,dmac-r8a7796" (R-Car M3-W)
 		- "renesas,dmac-r8a77970" (R-Car V3M)
+		- "renesas,dmac-r8a77980" (R-Car V3H)
 
 - reg: base address and length of the registers block for the DMAC