watchdog: orion: make available on feroceon-kw2 arch.

Change-Id: I869c48aeaa65ccb6f7897a470c4e3b11db752169
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 426fa8f..53f289e 100755
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -240,7 +240,7 @@
 
 config ORION_WATCHDOG
 	tristate "Orion watchdog"
-	depends on ARCH_ORION5X || ARCH_KIRKWOOD || ARCH_FEROCEON_KW
+	depends on ARCH_ORION5X || ARCH_KIRKWOOD || ARCH_FEROCEON_KW || ARCH_FEROCEON_KW2
 	help
 	  Say Y here if to include support for the watchdog timer
 	  in the Marvell Orion5x and Kirkwood ARM SoCs.