This re-enables Vulkan ES3 context creation and adds the necessary dEQP
suppressions.

Bug: angleproject:2950
Change-Id: Ic24a9fb4f867f3bce08f101e056f208abf84bb5e
Reviewed-on: https://chromium-review.googlesource.com/c/1483311
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>