watchdog: sp805: disable watchdog on remove

Disable the watchdog if it is active while removing the module.
It is necessary in order to prevent a reset in case watchdog
hw was running before the removal.

Signed-off-by: Eliav Farber <farbere@amazon.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20220414054233.1357-2-farbere@amazon.com


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