We've removed the yocto-bsp tool, so we now need to remove the menu item and associated code from the Eclipse plugin.
https://lists.yoctoproject.org/pipermail/eclipse-poky/2018-January/000041.html
https://lists.yoctoproject.org/pipermail/eclipse-poky/2018-January/000046.html
Merged to master, oxygen-master, oxygen/sumo.