arm64: dts: renesas: white-hawk-cpu: Add missing bootargs

This patch adds missing bootargs for R-Car V4H White Hawk board.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87k06858oe.wl-kuninori.morimoto.gx@renesas.comSigned-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

arch/arm64/boot/dts/renesas/r8a779g0-white-hawk-cpu.dtsi

@@ -21,6 +21,7 @@ aliases {
 	};
 
 	chosen {
+		bootargs = "ignore_loglevel rw root=/dev/nfs ip=on";
 		stdout-path = "serial0:921600n8";
 	};