uboot-imx

moveconfig: Output a list of failed boards

If boards fail, output that list to a file so that it can easily be
passed back into moveconfig.py using the -d option.

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
Acked-by: Masahiro Yamada <yamada.masahiro@socionext.com>