linux-imx

ARM: dts: stm32: add iwdg2 support for stm32mp157c-ed1

This patch activates independent watchdog support for
stm32mp157c board.

Signed-off-by: Ludovic Barre <ludovic.barre@st.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>