benchmarks/gem_blt: Estimate memory bandwidth to improve test runtime

If we autotune the workload to only take 0.1s and then repeat the
measurements over 2s, we can bound the benchmark runtime. (Roughly of
course! Sometimes the dispartity between main memory CPU bandwidth, and
GPU execution bandwidth throws off the runtime, but that's the purpose
of the benchmark!)

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

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