dt-bindings: watchdog: add SMARC-sAM67 support

The SMARC-sAM67 board has an on-board uC which has the same register
interface as the older CPLD implementation on the SMARC-sAL28 board.
Although the MCU emulates the same behavior, be prepared for any quirks
and add a board specific compatible.

Signed-off-by: Michael Walle <mwalle@kernel.org>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>

Author: mwalle

Documentation/devicetree/bindings/watchdog/kontron,sl28cpld-wdt.yaml

@@ -18,7 +18,12 @@ allOf:
 
 properties:
   compatible:
-    const: kontron,sl28cpld-wdt
+    oneOf:
+      - items:
+          - enum:
+              - kontron,sa67mcu-wdt
+          - const: kontron,sl28cpld-wdt
+      - const: kontron,sl28cpld-wdt
 
   reg:
     maxItems: 1