uboot: Add console messages to the first vt

Right now we direct all of the console messages the kernel spews to the serial
console. It would be useful to also see these messages on the first virtual
terminal.

Change-Id: I8d0fb49f57a7f822f1020251d8f5c01a494cc4db
diff --git a/debian/boot.txt b/debian/boot.txt
index 0e61229..80d0a7a 100644
--- a/debian/boot.txt
+++ b/debian/boot.txt
@@ -12,7 +12,7 @@
     setenv root ${mmc_root}
 fi
 
-cmdline="console=ttymxc0,115200 earlycon=ec_imx6q,0x30860000,115200 root=${root} rootfstype=ext4 rw rootwait init=/sbin/init net.ifnames=0"
+cmdline="console=ttymxc0,115200 console=tty0 earlycon=ec_imx6q,0x30860000,115200 root=${root} rootfstype=ext4 rw rootwait init=/sbin/init net.ifnames=0"
 
 ext2load mmc ${bootdev}:1 ${loadaddr} ${image}
 ext2load mmc ${bootdev}:1 ${fdt_addr} ${fdt_file}