dt-bindings: serial: renesas,hscif: Document r8a779f0 bindings

Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Link: https://lore.kernel.org/r/20220613131007.10027-1-wsa+renesas@sang-engineering.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/devicetree/bindings/serial/renesas,hscif.yaml

@@ -57,6 +57,7 @@ properties:
       - items:
           - enum:
               - renesas,hscif-r8a779a0     # R-Car V3U
+              - renesas,hscif-r8a779f0     # R-Car S4-8
               - renesas,hscif-r8a779g0     # R-Car V4H
           - const: renesas,rcar-gen4-hscif # R-Car Gen4
           - const: renesas,hscif           # generic HSCIF compatible UART