watchdog: Remove ARCH_KIRKWOOD dependency

mach-kirkwood has been removed, now that kirkwood lives in mach-mvebu.
ARCH_MVEBU is sufficient.
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Cc: Wim Van Sebroeck <wim@iguana.be>
Cc: linux-watchdog@vger.kernel.org
Link: https://lkml.kernel.org/r/1409417172-6846-7-git-send-email-andrew@lunn.chSigned-off-by: Jason Cooper <jason@lakedaemon.net>

drivers/watchdog/Kconfig

@@ -301,7 +301,7 @@ config DAVINCI_WATCHDOG
 
 config ORION_WATCHDOG
 	tristate "Orion watchdog"
-	depends on ARCH_ORION5X || ARCH_KIRKWOOD || ARCH_DOVE || MACH_DOVE || ARCH_MVEBU
+	depends on ARCH_ORION5X || ARCH_DOVE || MACH_DOVE || ARCH_MVEBU
 	select WATCHDOG_CORE
 	help
 	  Say Y here if to include support for the watchdog timer