dt-bindings: phy: renesas,usb3-phy: Add r8a774e1 support

Document RZ/G2H (R8A774E1) SoC bindings.
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/1594919915-5225-10-git-send-email-prabhakar.mahadev-lad.rj@bp.renesas.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

Documentation/devicetree/bindings/phy/renesas,usb3-phy.yaml

@@ -15,6 +15,7 @@ properties:
       - enum:
           - renesas,r8a774a1-usb3-phy # RZ/G2M
           - renesas,r8a774b1-usb3-phy # RZ/G2N
+          - renesas,r8a774e1-usb3-phy # RZ/G2H
           - renesas,r8a7795-usb3-phy  # R-Car H3
           - renesas,r8a7796-usb3-phy  # R-Car M3-W
           - renesas,r8a77961-usb3-phy # R-Car M3-W+