[WATCHDOG] s3c2410_wdt announce initialisation

Announce the watchdog once the initialisation is
complete. This aides debugging problems where the
watchdog driver has been loaded and shows the
current state for the user.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>