watchdog: Correct kerneldoc warnings

watchdog: Correct kerneldoc warnings

Correct kerneldoc syntax or drop kerneldoc entirely for function
comments not being kerneldoc to fix warnings like:

  pretimeout_noop.c:19: warning: Function parameter or struct member 'wdd' not described in 'pretimeout_noop'

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20250406203531.61322-2-krzysztof.kozlowski@linaro.org
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>