ARM: dts: stm32: Remove rdinit from bootargs on stm32f429-disco

The rootfs is independent from the board.
Signed-off-by: Alexandre TORGUE <alexandre.torgue@st.com>

arch/arm/boot/dts/stm32f429-disco.dts

@@ -54,7 +54,7 @@ / {
 	compatible = "st,stm32f429i-disco", "st,stm32f429";
 
 	chosen {
-		bootargs = "root=/dev/ram rdinit=/linuxrc";
+		bootargs = "root=/dev/ram";
 		stdout-path = "serial0:115200n8";
 	};