ARM: dts: uniphier: use stdout-path instead of console

Sync device trees with Linux.

Linux commit: 06ff6b2d63210922a1b1d0f4997e29ce75b5e0c0

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/arch/arm/dts/uniphier-proxstream2-vodka.dts b/arch/arm/dts/uniphier-proxstream2-vodka.dts
index 92d7404..63bd363 100644
--- a/arch/arm/dts/uniphier-proxstream2-vodka.dts
+++ b/arch/arm/dts/uniphier-proxstream2-vodka.dts
@@ -19,8 +19,7 @@
 	};
 
 	chosen {
-		bootargs = "console=ttyS2,115200";
-		stdout-path = &serial2;
+		stdout-path = "serial2:115200n8";
 	};
 
 	aliases {