Chris Wilson 14f70a861b igt/gem_read_read_speed: Tweak to show comparison against write-write
Since we hold an exclusive write lock we expect 2 writes to happen
serially, but we expect 2 reads to happen in parallel. Expand the testing
to demonstrate this effect (i.e. we expect read-read to be roughly 2x
faster than write-write for small copies on big core.)

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