Add Vulkan SDK for Linux asset

Also add Vulkan tasks for Linux NUC to use the asset.  Still need to
update the recipes, which will happen in a followup CL.

BUG=skia:6089

Change-Id: Ie215c98a03016c00ee2f2c8da281fd565e8900ce
Reviewed-on: https://skia-review.googlesource.com/7165
Commit-Queue: Kevin Lubick <kjlubick@google.com>
Reviewed-by: Eric Boren <borenet@google.com>
11 files changed