watchdog: orion: fix spelling mistake: "harcoded" -> "hardcoded"

Trivial fix to spelling mistake in WARN message

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>