dt-bindings: thermal: rcar-thermal: Add device tree support for r8a7742

Add thermal sensor support for r8a7742 SoC. The Renesas RZ/G1H
(r8a7742) thermal sensor module is identical to the R-Car Gen2 family.

No driver change is needed due to the fallback compatible value
"renesas,rcar-gen2-thermal".
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: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/thermal/rcar-thermal.yaml

@@ -20,6 +20,7 @@ properties:
           - const: renesas,rcar-thermal # Generic without thermal-zone
       - items:
           - enum:
+              - renesas,thermal-r8a7742 # RZ/G1H
               - renesas,thermal-r8a7743 # RZ/G1M
               - renesas,thermal-r8a7744 # RZ/G1N
           - const: renesas,rcar-gen2-thermal # Generic thermal-zone