drm-ci: flaky tests for mediatek driver testing

[Vignesh Raman]

Hi Maintainers,

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

# Board Name: mt8173-elm-hana
# IGT Version: 1.28-g0df7b9b97
# Linux Version: 6.9.0-rc7
# Failure Rate: 50
core_setmaster_vs_auth
dumb_buffer at create-clear
fbdev at unaligned-write
fbdev at write
kms_cursor_legacy at cursor-vs-flip-atomic-transitions
kms_prop_blob at invalid-set-prop

Will add these tests in 
drivers/gpu/drm/ci/xfails/mediatek-mt8173-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