hwmon: (ftsteutates) Use devm_watchdog_register_device()

Use devm_watchdog_register_device() to let devres take care
of unregistering the watchdog at device removal. Remove the
now pointless fts_remove() function.

Tested on a Fujitsu DS3401-B1.

Signed-off-by: Armin Wolf <W_Armin@gmx.de>
Link: https://lore.kernel.org/r/20221224041855.83981-4-W_Armin@gmx.de


Signed-off-by: Guenter Roeck <linux@roeck-us.net>