dt-bindings: watchdog: cdns,wdt-r1p2: Convert cadence watchdog to yaml

Convert cadence watchdog bindings to DT schema format using json-schema.

Signed-off-by: Srinivas Neeli <srinivas.neeli@amd.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230601052237.2604997-1-srinivas.neeli@amd.com


Signed-off-by: Rob Herring <robh@kernel.org>