Vulkan: Enable previously failing clear tests
Vulkan: Enable previously failing clear tests

These tests crashed in FramebufferVk::clearWithAttachment, which no
longer exists.

Bug: angleproject:3081
Change-Id: I6b01c311c4caed21a920e5d5db1195c2dbfb905a
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1661554
Reviewed-by: Geoff Lang <b6fc25fe0362055230985c05cbfa8adb741ccc0f@chromium.org>
Commit-Queue: Shahbaz Youssefi <582eeec4f08a2ccd61e3ef52115e6e7c571582de@chromium.org>

ppy/angle,ppy/angle,ppy/angle,ppy/angle