sysupgrade command fails due to missing U-Boot environment-processing binaries on sysupgrade ramdisk. The missing binaries result in the following output:
Switching to ramdisk...
Performing system upgrade...
ash: /usr/sbin/fw_printenv: not found
ash: fw_setenv: not found
ash: touch: not found
cannot find target partition
Fixes FS#197.
Signed-off-by: Aaron Curley <accwebs@gmail.com>