leds: Remove ARCH_KIRKWOOD dependency

mach-kirkwood has been removed, now that kirkwood lives in mach-mvebu.
Use MACH_KIRKWOOD which will be set when kirkwood is built as part of
mach-mvebu.
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Acked-by: Bryan Wu <cooloney@gmail.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: linux-leds@vger.kernel.org
Link: https://lkml.kernel.org/r/1409417172-6846-5-git-send-email-andrew@lunn.chSigned-off-by: Jason Cooper <jason@lakedaemon.net>

drivers/leds/Kconfig

@@ -410,7 +410,7 @@ config LEDS_MC13783
 config LEDS_NS2
 	tristate "LED support for Network Space v2 GPIO LEDs"
 	depends on LEDS_CLASS
-	depends on ARCH_KIRKWOOD || MACH_KIRKWOOD
+	depends on MACH_KIRKWOOD
 	default y
 	help
 	  This option enable support for the dual-GPIO LED found on the
@@ -420,7 +420,7 @@ config LEDS_NS2
 config LEDS_NETXBIG
 	tristate "LED support for Big Network series LEDs"
 	depends on LEDS_CLASS
-	depends on ARCH_KIRKWOOD || MACH_KIRKWOOD
+	depends on MACH_KIRKWOOD
 	default y
 	help
 	  This option enable support for LEDs found on the LaCie 2Big