ARM: configs: stm32: Add watchdog support in STM32 defconfig

This patch adds STM32 watchdog support in stm32_defconfig file
Signed-off-by: Yannick Fertre <yannick.fertre@st.com>
Signed-off-by: Alexandre TORGUE <alexandre.torgue@st.com>

arch/arm/configs/stm32_defconfig

@@ -52,6 +52,7 @@ CONFIG_I2C=y
 CONFIG_I2C_CHARDEV=y
 CONFIG_I2C_STM32F4=y
 # CONFIG_HWMON is not set
+CONFIG_WATCHDOG=y
 CONFIG_REGULATOR=y
 CONFIG_REGULATOR_FIXED_VOLTAGE=y
 # CONFIG_USB_SUPPORT is not set