We get a lot of useful coverage from running graphicsfuzz with spilling
enabled, but it's also pretty slow and can cause intermittent hangcheck
failures. I thought I'd categorized them when merging !14839 (device loss
on reset), but it looks like not all of them and we're now more likely to
have flakes take out the whole test run when a single flake makes the rest
of the caselist a flake.
This is a little unfortunate in that it means our test environment is not
the same as a stock system you would want to run deqp on to submit
conformance, but I think it's an improvement in the test maintenance work
vs needing to fix things up later.
We have some other tests besides turnip that can trigger hangchecks which
we might also like this increase for (some disabled traces, for example).
However, freedreno GL has a 5-second timeout waiting for idle when
mapping, and a couple of 2-second timeouts in a row can result in spurious
failures in other tests!
Fixes: #6163
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15435>
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