dt-bindings: arm: renesas: Document RZ/G2H SoC DT bindings

Add device tree binding documentation for the Renesas RZ/G2H (r8a774e1)
SoC.
Signed-off-by: Marian-Cristian Rotariu <marian-cristian.rotariu.rb@bp.renesas.com>
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Link: https://lore.kernel.org/r/1594138368-16449-2-git-send-email-prabhakar.mahadev-lad.rj@bp.renesas.comSigned-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

Documentation/devicetree/bindings/arm/renesas.yaml

@@ -150,6 +150,10 @@ properties:
           - const: si-linux,cat874
           - const: renesas,r8a774c0
 
+      - description: RZ/G2H (R8A774E1)
+        items:
+          - const: renesas,r8a774e1
+
       - description: R-Car M1A (R8A77781)
         items:
           - enum: