drm/ttm: Export the ttm_k[un]map_atomic_prot API.
It will be used by vmwgfx cpu blit. Reviewed-by: NChristian König <christian.koenig@amd.com> Reviewed-by: NBrian Paul <brianp@vmware.com> Signed-off-by: NThomas Hellstrom <thellstrom@vmware.com>
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