dt-bindings: usb: renesas,usbhs: 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>
Signed-off-by: Felipe Balbi <balbi@kernel.org>

Documentation/devicetree/bindings/usb/renesas,usbhs.yaml

@@ -40,6 +40,7 @@ properties:
               - renesas,usbhs-r8a774c0 # RZ/G2E
               - renesas,usbhs-r8a7795  # R-Car H3
               - renesas,usbhs-r8a7796  # R-Car M3-W
+              - renesas,usbhs-r8a77961 # R-Car M3-W+
               - renesas,usbhs-r8a77965 # R-Car M3-N
               - renesas,usbhs-r8a77990 # R-Car E3
               - renesas,usbhs-r8a77995 # R-Car D3