boards: ls2080: Fix default bootargs

A white space is missing in multiple-line string for bootargs.

Signed-off-by: York Sun <york.sun@nxp.com>
diff --git a/include/configs/ls2080a_common.h b/include/configs/ls2080a_common.h
index c9b0a2f..13ce349 100644
--- a/include/configs/ls2080a_common.h
+++ b/include/configs/ls2080a_common.h
@@ -260,7 +260,7 @@
 	" 0x580800000 \0"
 
 #define CONFIG_BOOTARGS		"console=ttyS0,115200 root=/dev/ram0 " \
-				"earlycon=uart8250,mmio,0x21c0500" \
+				"earlycon=uart8250,mmio,0x21c0500 " \
 				"ramdisk_size=0x2000000 default_hugepagesz=2m" \
 				" hugepagesz=2m hugepages=256"
 #define CONFIG_BOOTCOMMAND	"fsl_mc apply dpl 0x580700000 &&" \