sna/gen4: Sacrifice performance to workaround render corruption

The long running saga of trying to find an acceptable workaround for the
gen4 rendering corruption (seems to be a read-write hazard failure inside
the gpu) is failing, the only w/a found so far is to send a single
rectangle through the GPU at a time.

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

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