dt-bindings: phy: renesas,usb2-phy: Add r8a774e1 support

Document SoC specific bindings for RZ/G2H (r8a774e1) SoC.
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/1594919915-5225-6-git-send-email-prabhakar.mahadev-lad.rj@bp.renesas.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

Documentation/devicetree/bindings/phy/renesas,usb2-phy.yaml

@@ -21,6 +21,7 @@ properties:
               - renesas,usb2-phy-r8a774a1 # RZ/G2M
               - renesas,usb2-phy-r8a774b1 # RZ/G2N
               - renesas,usb2-phy-r8a774c0 # RZ/G2E
+              - renesas,usb2-phy-r8a774e1 # RZ/G2H
               - renesas,usb2-phy-r8a7795  # R-Car H3
               - renesas,usb2-phy-r8a7796  # R-Car M3-W
               - renesas,usb2-phy-r8a77961 # R-Car M3-W+