igt/gem_exec_latency: Wire up an interloper for preemption

For measuring the cost of preemption, inject a low priority spinner
between the two measurements; the difference between the preemption and
the normal dispatch includes both the cost of the spinner dispatch and
of preempting it. Close enough for us to estimate the cost of
preemption, though we don't measure the cost of preemption on the local
ring!

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
CC: Michał Winiarski <michal.winiarski@intel.com>

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