drm/ttm: add ttm_sg_tt_init
This allows drivers to only allocate dma addresses, but not a page array. Signed-off-by: NChristian König <christian.koenig@amd.com> Reviewed-by: NRoger He <Hongbo.He@amd.com> Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
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