dt-bindings: ata: renesas,rcar-sata: Add r8a7742 support

Document SATA support for the RZ/G1H, which is compatible with
R-Car Gen2 SoC family.
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Marian-Cristian Rotariu <marian-cristian.rotariu.rb@bp.renesas.com>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/ata/renesas,rcar-sata.yaml

@@ -17,6 +17,7 @@ properties:
               - renesas,sata-r8a7779      # R-Car H1
       - items:
           - enum:
+              - renesas,sata-r8a7742      # RZ/G1H
               - renesas,sata-r8a7790-es1  # R-Car H2 ES1
               - renesas,sata-r8a7790      # R-Car H2 other than ES1
               - renesas,sata-r8a7791      # R-Car M2-W