Relax get_frame_timestamps

Relax get_frame_timestamps

To prevent power side effect from legacy platform. We tend to relax the
deqp criteria from 3 vsyncs to 4 vsyncs. And verify timestamp 6 frames
ago.

Cherry pick from AOSP.

Original commit:
https://android.googlesource.com/platform/external/deqp/+/db1f80ba923b9e89177562203c21192f8e7340c3
https://android-review.googlesource.com/c/platform/external/deqp/+/918914
Submitted on behalf of a third-party: barry.ko@mediatek.com

Component: EGL

Affected tests:
dEQP-EGL.functional.get_frame_timestamps.*

BUG: 123203074
Change-Id: I214b410d2ab8f0d6d4b3f9d6752c1c1d756cc28f