The console bootarg is being corrupted on boot, causing various issues
including broken sysupgrade.
Utilising the bootargs mangle patch from other targets, hardcode the console
arguments and fetch the rootfs from the bootloader.
Kernel command line: console=ttyS0,115200 root=/dev/mtdblock8
Bootloader command line (ignored): console= root=/dev/mtdblock8
Please cherry pick to 18.06 too
Signed-off-by: Michael Gray <michael.gray@lantisproject.com>
4fdc6ca31b