dt-bindings: dma: renesas,usb-dmac: Add binding for r8a774e1

Add binding for R8A774E1 SoC (RZ/G2H).
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Marian-Cristian Rotariu <marian-cristian.rotariu.rb@bp.renesas.com>
Link: https://lore.kernel.org/r/1594919915-5225-13-git-send-email-prabhakar.mahadev-lad.rj@bp.renesas.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

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

@@ -24,6 +24,7 @@ properties:
           - renesas,r8a774a1-usb-dmac # RZ/G2M
           - renesas,r8a774b1-usb-dmac # RZ/G2N
           - renesas,r8a774c0-usb-dmac # RZ/G2E
+          - renesas,r8a774e1-usb-dmac # RZ/G2H
           - renesas,r8a7790-usb-dmac  # R-Car H2
           - renesas,r8a7791-usb-dmac  # R-Car M2-W
           - renesas,r8a7793-usb-dmac  # R-Car M2-N