ninetcfgutil: remove support for config script on configfs
ninetcfgutil: remove support for config script on configfs

The configfs is going away so it no longer makes sense to read a script
specifically from there, as opposed to the rootfs. This facility has
never been used.

Signed-off-by: Richard Tollerton <67c688e7f7482ba5c4ebe3d70bc77594748182a6@ni.com>

ni/meta-nilrt,ni/meta-nilrt,ni/meta-nilrt,ni/meta-nilrt,ni/meta-nilrt