ARM: mxs_defconfig: Select watchdog driver

Select watchdog driver.
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

arch/arm/configs/mxs_defconfig

@@ -99,6 +99,8 @@ CONFIG_SPI_MXS=y
 CONFIG_DEBUG_GPIO=y
 CONFIG_GPIO_SYSFS=y
 # CONFIG_HWMON is not set
+CONFIG_WATCHDOG=y
+CONFIG_STMP3XXX_RTC_WATCHDOG=y
 CONFIG_REGULATOR=y
 CONFIG_REGULATOR_FIXED_VOLTAGE=y
 CONFIG_FB=y