We previously used the existing Android target for vulkan headers but it
does not roll as fast as ANGLE's, possibly causing divergence in test
results.

BUG=angleproject:2344
BUG=b:150892231

Change-Id: Ibef33b266943c040219529f64ea8cd29c8c9bf83
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2090394Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Tim Van Patten <timvp@google.com>
Commit-Queue: Geoff Lang <geofflang@chromium.org>