[WATCHDOG] Clean out header of s3c2410_wdt driver.

Remove the changelog from the top of the driver, which
is redundant as this information is more accurately
represented from the revision control holding the
file.

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