For consistancy and dependencies between uboot and uboot-tools,
this patch migrates the script creation over in a similar way as
the env image creation.
Cc: Arnout Vandecappelle <arnout@mind.be>
Signed-off-by: Matthew Weber <matthew.weber@rockwellcollins.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>