[WATCHDOG] Correct WDIOF_MAGICCLOSE flag

Make sure that when the WDIOF_MAGICCLOSE flag is set we also
support the magic-close feature...

Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

diff --git a/drivers/watchdog/at91sam9_wdt.c b/drivers/watchdog/at91sam9_wdt.c
index 435b057..eac2602 100644
--- a/drivers/watchdog/at91sam9_wdt.c
+++ b/drivers/watchdog/at91sam9_wdt.c
@@ -156,7 +156,8 @@
 
 static const struct watchdog_info at91_wdt_info = {
 	.identity	= DRV_NAME,
-	.options	= WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
+	.options	= WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING |
+						WDIOF_MAGICCLOSE,
 };
 
 /*