watchdog: stm32mp: Add watchdog driver

This patch adds IWDG (Independent WatchDoG) support for
STM32MP platform.

Signed-off-by: Christophe Kerello <christophe.kerello@st.com>
Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Reviewed-by: Stefan Roese <sr@denx.de>
diff --git a/arch/arm/mach-stm32mp/Kconfig b/arch/arm/mach-stm32mp/Kconfig
index a8b09fb..d9ad6b4 100644
--- a/arch/arm/mach-stm32mp/Kconfig
+++ b/arch/arm/mach-stm32mp/Kconfig
@@ -17,6 +17,7 @@
 	select SPL_DM_RESET
 	select SPL_SERIAL_SUPPORT
 	select SPL_SYSCON
+	select SPL_WATCHDOG_SUPPORT
 	imply BOOTSTAGE_STASH if SPL_BOOTSTAGE
 	imply SPL_BOOTSTAGE if BOOTSTAGE
 	imply SPL_DISPLAY_PRINT