malta missed out from snapshot and release builds

[Yousong Zhou]

Timestamp of the last snapshot build is "Tue Jan 24 13:01:09 2017"
[1].  It's missing from all 17.01.0 release builds.

Not sure how this happened, but we need to fix this.

 [1] http://downloads.lede-project.org/snapshots/targets/malta/

Regards,
                yousong