drm/nouveau: slowpath for pushbuf ioctl

We can't copy_*_user while holding reservations, that will (soon even
for nouveau) lead to deadlocks. And it breaks the cross-driver
contract around dma_resv.

Fix this by adding a slowpath for when we need relocations, and by
pushing the writeback of the new presumed offsets to the very end.

Aside from "it compiles" entirely untested unfortunately.

Cc: Ilia Mirkin <[email protected]>
Cc: Maarten Lankhorst <[email protected]>
Cc: Ben Skeggs <[email protected]>
Cc: [email protected]
Reviewed-by: Maarten Lankhorst <[email protected]>
Acked-by: Dave Airlie <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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