dt-bindings: iommu: renesas,ipmmu-vmsa: Add r8a774e1 support

Document RZ/G2H (R8A774E1) SoC bindings.
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Link: https://lore.kernel.org/r/1594676120-5862-2-git-send-email-prabhakar.mahadev-lad.rj@bp.renesas.comSigned-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/iommu/renesas,ipmmu-vmsa.yaml

@@ -32,6 +32,7 @@ properties:
           - enum:
               - renesas,ipmmu-r8a774a1 # RZ/G2M
               - renesas,ipmmu-r8a774b1 # RZ/G2N
+              - renesas,ipmmu-r8a774e1 # RZ/G2H
               - renesas,ipmmu-r8a774c0 # RZ/G2E
               - renesas,ipmmu-r8a7795  # R-Car H3
               - renesas,ipmmu-r8a7796  # R-Car M3-W