Flaky tests for amdgpu

[Vignesh Raman]

Hi Maintainers,

There are some flaky tests reported for amdgpu driver testing in drm-ci.

# Board Name: hp-11A-G6-EE-grunt
# IGT Version: 1.28-gb0cc8160e
# Linux Version: 6.7.0-rc3

Pipeline url:
https://gitlab.freedesktop.org/vigneshraman/linux/-/jobs/54373774

# Reported by deqp-runner
amdgpu/amd_pci_unplug at amdgpu_hotunplug_simple
amdgpu/amd_pci_unplug at amdgpu_hotunplug_with_exported_bo

Will add these tests in 
drivers/gpu/drm/ci/xfails/amdgpu-stoney-flakes.txt 
(https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/Documentation/gpu/automated_testing.rst#n70)

Please could you have a look at these test results and let us know if 
you need more information. Thank you.

Regards,
Vignesh