Enable tests that don't use fixed or unnormalized short/byte vertex data,
with some exceptions for Android and AMD.

BUG=angleproject:2405

Change-Id: I9e37ebca3a873617f11fee065b7a0ba67f80998c
Reviewed-on: https://chromium-review.googlesource.com/1111317
Commit-Queue: Frank Henigman <fjhenigman@chromium.org>
Reviewed-by: Luc Ferron <lucferron@chromium.org>