[WATCHDOG] w83627hf_wdt trivial typo

The most trivial typo fix in the world.

Signed-off-by: Pozsar Balazs <pozsy@uhulinux.hu>
Signed-off-by: Pdraig Brady <P@draigBrady.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>