dt-bindings: watchdog: Document Qualcomm QCS615 watchdog

Add devicetree binding for watchdog present on Qualcomm QCS615 SoC.

Signed-off-by: Lijuan Gao <quic_lijuang@quicinc.com>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Reviewed-by: Guenter Roeck <linux@roeck-usn.net>
Link: https://lore.kernel.org/r/20240920-add_watchdog_compatible_for_qcs615-v2-1-427944f1151e@quicinc.com


Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>