[without BMG] igt@kms_flip@*flip-vs-expired-vblank@ subtests - fail - Failed assertion: end - start < 500

https://intel-gfx-ci.01.org/tree/drm-tip/xe-204-ee454cf4046170833f005c9591fb80a67df81f07/re-dg2-15/igt@kms_flip@2x-flip-vs-expired-vblank@ac-dp3-dp4.html

Starting dynamic subtest: AC-DP3-DP4
(kms_flip:1471) CRITICAL: Test assertion failure function run_test_step, file ../../../usr/src/igt-gpu-tools/tests/kms_flip.c:734:
(kms_flip:1471) CRITICAL: Failed assertion: end - start < 500
Dynamic subtest AC-DP3-DP4 failed.