drm/i915: Allow compaction upto SWIOTLB max segment size

commit 1625e7e549c5 ("drm/i915: make compact dma scatter lists creation
work with SWIOTLB backend") took a heavy handed approach to undo the
scatterlist compaction in the face of SWIOTLB. (The compaction hit a bug
whereby we tried to pass a segment larger than SWIOTLB could handle.) We
can be a little more intelligent and try compacting the scatterlist up
to the maximum SWIOTLB segment size (when using SWIOTLB).

v2: Tidy sg_mark_end() and cpp

Signed-off-by: Chris Wilson <[email protected]>
CC: Imre Deak <[email protected]>
CC: Daniel Vetter <[email protected]>
Cc: Konrad Rzeszutek Wilk <[email protected]>
Cc: Tvrtko Ursulin <[email protected]>
Reviewed-by: Tvrtko Ursulin <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]

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