dt-bindings: watchdog: qcom-wdt: document support on SA8255p

Add a compatible for the SA8255p platform's KPSS watchdog.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Nikunj Kela <quic_nkela@quicinc.com>
Link: https://lore.kernel.org/r/20240910165926.2408630-1-quic_nkela@quicinc.com


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