[PATCH v3] i915/gt/selftests: Disable lrc_timestamp test

[Krzysztof Karas]

Hi Mikolaj,

> This test was designed to isolate a bug in tigerlake and dg2 hardware.
> The bug was found and fixed in newer generations.
> Since we won't support any new hardware with this driver, the test
> should now be turned off in the CI to not pollute it with random failures
> on previous hardware.
> 
> Fixes: https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/13697
> 
> Signed-off-by: Mikolaj Wasiak <mikolaj.wasiak at intel.com>
> Reviewed-by: Chris Wilson <chris.p.wilson at linux.intel.com>

Reviewed-by: Krzysztof Karas <krzysztof.karas at intel.com>

Best Regards,
Krzysztof