igt/gem_ctx_thrash: Order writes between contexts

The test wrote to the same dwords from multiple contexts, assuming that
the writes would be ordered by its submission. However, as it was using
multiple contexts without a write hazard, those timelines are not
coupled and the requests may be emitted to hw in any order. So emit a
write hazard for each individual dword in the scratch (avoiding the
write hazard for the scratch as a whole) to ensure the writes do occur
in the expected order.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>

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