drm/radeon: Set TTM_PL_FLAG_TOPDOWN also for RADEON_GEM_CPU_ACCESS BOs

I wasn't sure if TTM_PL_FLAG_TOPDOWN works correctly with non-0 lpfn, but
AFAICT it does.

Reviewed-by: Lauri Kasanen <cand@gmx.com>
Signed-off-by: Michel Dänzer <michel.daenzer@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
1 file changed