watchdog: iTCO_wdt: use dev_*() instead of pr_*() for logging

For device log outputs, it's better to have device name / ID
prefixed in all messages, so use the proper dev_*() functions here.

Explicit message on module load/unload don't seem to be really helpful
(we have other means to check which modules have been loaded), instead
just add noise to the kernel log. So, removing them.

Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20201117152214.32244-2-info@metux.net


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