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>

arch/arm/mach-imx/Kconfig

@@ -821,6 +821,7 @@ config	SOC_IMX53
 	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