ARM: dts: imx7d-zii-rpu2: Fix incorrrect 'stdout-path'

RPU2 uses UART2 as a serial console and UART1 is not used at all. Fix
incorrrectly specified 'stdout-path' to reflect that.
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Cc: Shawn Guo <shawnguo@kernel.org>
Cc: Chris Healy <cphealy@gmail.com>
Cc: Fabio Estevam <festevam@gmail.com>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx7d-zii-rpu2.dts

@@ -16,7 +16,7 @@ / {
 	compatible = "zii,imx7d-rpu2", "fsl,imx7d";
 
 	chosen {
-		stdout-path = &uart1;
+		stdout-path = &uart2;
 	};
 
 	cs2000_ref: oscillator {