hudson: Discontinue Shield Tablet builds (for now)
* Turns out the Tegra rel-29 GL Fence Memory Leak issue exists
on 8.0+ under enough stress and the right conditions, instead
of the initial assumption that it was 9.0 only.
* Also, at some point in this cycle, Snap Camera stopped working
for us, so we'll be shipping NvCamera as of 16.0, but need
better OSS blobs from Nvidia, or some magical patch to fix the
fence leak to re-ship.