watchdog: sbsa: Drop status function

The watchdog status function is supposed to return WDIOF_ flags,
not internal status flags. The available WDIOF_ flags are now
returned by the watchdog core, so the status function in this driver
is unnecessary.

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