dt-bindings: phy: renesas: usb3-phy: add r8a77961 support

This patch adds support for r8a77961 (R-Car M3-W+).
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/1585301636-24399-5-git-send-email-yoshihiro.shimoda.uh@renesas.comAcked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>

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

@@ -17,6 +17,7 @@ properties:
           - renesas,r8a774b1-usb3-phy # RZ/G2N
           - renesas,r8a7795-usb3-phy  # R-Car H3
           - renesas,r8a7796-usb3-phy  # R-Car M3-W
+          - renesas,r8a77961-usb3-phy # R-Car M3-W+
           - renesas,r8a77965-usb3-phy # R-Car M3-N
       - const: renesas,rcar-gen3-usb3-phy