ARM: dts: stm32: update iwdg with lsi clock name for stm32f429

This patch updates iwdg watchdog to use lsi clock name.
Signed-off-by: NLudovic Barre <ludovic.barre@st.com>
Acked-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NAlexandre Torgue <alexandre.torgue@st.com>

arch/arm/boot/dts/stm32f429.dtsi

@@ -310,6 +310,7 @@
 			compatible = "st,stm32-iwdg";
 			reg = <0x40003000 0x400>;
 			clocks = <&clk_lsi>;
+			clock-names = "lsi";
 			status = "disabled";
 		};