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/MAINTAINERS b/MAINTAINERS
index 3662579..2e5a248 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -312,6 +312,7 @@
 F:	drivers/misc/stm32_rcc.c
 F:	drivers/reset/stm32-reset.c
 F:	drivers/spi/stm32_qspi.c
+F:	drivers/watchdog/stm32mp_wdt.c
 
 ARM STM STV0991
 M:	Vikas Manocha <vikas.manocha@st.com>