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/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 7a8619f..dbafb74 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -154,6 +154,14 @@
 	   Select this to enable SP805 watchdog timer, which can be found on some
 	   nxp layerscape chips.
 
+config WDT_STM32MP
+	bool "IWDG watchdog driver for STM32 MP's family"
+	depends on WDT
+	imply WATCHDOG
+	help
+	  Enable the STM32 watchdog (IWDG) driver. Enable support to
+	  configure STM32's on-SoC watchdog.
+
 config XILINX_TB_WATCHDOG
 	bool "Xilinx Axi watchdog timer support"
 	depends on WDT