sna/gen6+: Don't request extra caching for use-once upload buffers

As we only use these buffers once, we should not benefit from requesting
them to be moved into L3/LLC cache - over and above the default
recommendations we make when creating the buffer. Indeed, this may even
lead to artefacts if we fail to invalidate those other caches when
reusing the buffers.

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

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