phy: rcar-gen3-usb2: add binding for r8a77995

This patch adds binding for r8a77995 (R-Car D3). Since r8a77995 doesn't
have dedicated pins (ID, VBUS), this will match against the generic
fallback on R-Car D3.

For now, this driver doesn't support usb role swap for r8a77995.

Signed-off-by: Yoshihiro Shimoda <[e-mail]>
Reviewed-by: Simon Horman <[e-mail]>
Acked-by: Rob Herring <[e-mail]>
Signed-off-by: Kishon Vijay Abraham I <[e-mail]>

Documentation/devicetree/bindings/phy/rcar-gen3-phy-usb2.txt

···
 	      SoC.
 	      "renesas,usb2-phy-r8a7796" if the device is a part of an R8A7796
 	      SoC.
+	      "renesas,usb2-phy-r8a77995" if the device is a part of an
+	      R8A77995 SoC.
 	      "renesas,rcar-gen3-usb2-phy" for a generic R-Car Gen3 compatible device.
 
 	      When compatible with the generic version, nodes must list the