If the application asks for GL_FASTEST, this uses VK_FILTER_NEAREST
instead of VK_FILTER_LINEAR.

Bug: angleproject:4551
Change-Id: I6c10758104bd63dd477ea853a3b0464665f371ed
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2279132Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>