dt-bindings: watchdog: renesas-wdt: Add support for the r8a77970 wdt

Document support for the Watchdog Timer (WDT) Controller in the Renesas
R-Car V3M (r8a77970) SoC.  Restore sort order while at it.

No driver update is needed.
Signed-off-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Acked-by: NRob Herring <robh@kernel.org>
Reviewed-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NWim Van Sebroeck <wim@iguana.be>

Documentation/devicetree/bindings/watchdog/renesas-wdt.txt

@@ -4,10 +4,11 @@ Required properties:
 - compatible : Should be "renesas,<soctype>-wdt", and
 	       "renesas,rcar-gen3-wdt" or "renesas,rza-wdt" as fallback.
 	       Examples with soctypes are:
+	         - "renesas,r7s72100-wdt" (RZ/A1)
 	         - "renesas,r8a7795-wdt" (R-Car H3)
 	         - "renesas,r8a7796-wdt" (R-Car M3-W)
+	         - "renesas,r8a77970-wdt" (R-Car V3M)
 	         - "renesas,r8a77995-wdt" (R-Car D3)
-	         - "renesas,r7s72100-wdt" (RZ/A1)
 
   When compatible with the generic version, nodes must list the SoC-specific
   version corresponding to the platform first, followed by the generic