scripts: update_gpu_drivers: Using kevin and elm to build prebuilts

I doubt that many devs still have gru and oak boards setup on their
workstations, let's switch to building the prebuilts using kevin
and elm.

BUG=none
TEST=./update_gpu_drivers.sh --package img-ddk

Change-Id: Iea2839f03ad78aa6d75b938667ae6d112dc1388b
Reviewed-on: https://chromium-review.googlesource.com/906052
Commit-Ready: Nicolas Boichat <drinkcat@chromium.org>
Tested-by: Nicolas Boichat <drinkcat@chromium.org>
Reviewed-by: Stephen Barber <smbarber@chromium.org>
1 file changed