dt-bindings: thermal: rcar-gen3-thermal: Add r8a774b1 support

Document RZ/G2N (R8A774B1) SoC bindings.
Signed-off-by: Biju Das <biju.das@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/1569248589-52372-1-git-send-email-biju.das@bp.renesas.com

Documentation/devicetree/bindings/thermal/rcar-gen3-thermal.txt

@@ -8,6 +8,7 @@ Required properties:
 - compatible		: "renesas,<soctype>-thermal",
 			  Examples with soctypes are:
 			    - "renesas,r8a774a1-thermal" (RZ/G2M)
+			    - "renesas,r8a774b1-thermal" (RZ/G2N)
 			    - "renesas,r8a7795-thermal" (R-Car H3)
 			    - "renesas,r8a7796-thermal" (R-Car M3-W)
 			    - "renesas,r8a77965-thermal" (R-Car M3-N)