arm64: dts: imx8qxp: sort alias alphabetically

We prefer to sort alias entries alphabetically, so let's move serial0
to the right place.
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8qxp.dtsi

@@ -28,8 +28,8 @@ aliases {
 		mmc0 = &usdhc1;
 		mmc1 = &usdhc2;
 		mmc2 = &usdhc3;
-		serial0 = &adma_lpuart0;
 		mu1 = &lsio_mu1;
+		serial0 = &adma_lpuart0;
 	};
 
 	cpus {