Enable ETC2/EAC formats on newer Intel GPUs.

Bug: angleproject:1552
Change-Id: I240b07d6d81d48e1e03dfcd56aad6fa9f1d7817f
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2690952Reviewed-by: Jonah Ryan-Davis <jonahr@google.com>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Alexey Knyazev <lexa.knyazev@gmail.com>