Update AOSP mustpass for flush/wait test.

Update AOSP mustpass for flush/wait test.

The dEQP-GLES3.functional.flush_finish.flush_wait test now produces a
CompatibilityWarning instead of a Failure if the (overly strict) test
assumptions aren't met. Hence it can be added back to the mustpass set.

See:
https://android-review.googlesource.com/c/platform/external/deqp/+/600456

VK-GL-CTS issue: 975
Google bug: b/71858368
Khronos bug: 13916
internal bug: 20558284
Components: AOSP
Affects: dEQP-GLES2.functional.flush_finish.*,
dEQP-GLES3.functional.flush_finish.*

Change-Id: I3ac84b6f95986dac95b9a8e5ccff95fd384c096c