watchdog: Support imx watchdog on SOC_IMX53

This patch fixes watchdog support after devicetree switch for imx53

Signed-off-by: Roland Stigge <stigge@antcom.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
diff --git a/arch/arm/mach-imx/Kconfig b/arch/arm/mach-imx/Kconfig
index 01a2597..4e24b8c 100644
--- a/arch/arm/mach-imx/Kconfig
+++ b/arch/arm/mach-imx/Kconfig
@@ -821,6 +821,7 @@
 	select ARCH_MX5
 	select ARCH_MX53
 	select HAVE_CAN_FLEXCAN if CAN
+	select IMX_HAVE_PLATFORM_IMX2_WDT
 	select PINCTRL
 	select PINCTRL_IMX53
 	select SOC_IMX5