dt-bindings: dma: rz-dmac: Document RZ/G3E family of SoCs

The DMAC block on the RZ/G3E SoC is identical to the one found on the
RZ/V2H(P) SoC.

No driver changes are required, as `renesas,r9a09g057-dmac` will be used
as a fallback compatible string on the RZ/G3E SoC.

Signed-off-by: Tommaso Merciai <[e-mail]>
Acked-by: Conor Dooley <[e-mail]>
Reviewed-by: Geert Uytterhoeven <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Vinod Koul <[e-mail]>

Documentation/devicetree/bindings/dma/renesas,rz-dmac.yaml

···
               - renesas,r9a08g045-dmac # RZ/G3S
           - const: renesas,rz-dmac
 
+      - items:
+          - enum:
+              - renesas,r9a09g047-dmac # RZ/G3E
+          - const: renesas,r9a09g057-dmac
+
       - const: renesas,r9a09g057-dmac # RZ/V2H(P)
 
   reg: