drm/ttm: Add DRM_MM_SEARCH_BELOW for TTM_PL_FLAG_TOPDOWN
drm/ttm: Add DRM_MM_SEARCH_BELOW for TTM_PL_FLAG_TOPDOWN

If the BO should be placed at the top of the area, we should start looking
for holes from the top.

Reviewed-by: Lauri Kasanen <fbaa1710f5685e9772d76f549035a0a3df1c04aa@gmx.com>
Signed-off-by: Michel Dänzer <242b79f0804cf52679d58f27ed754158c1323c75@amd.com>
Signed-off-by: Alex Deucher <08dc22c6156113f2deff178e35e3ed9b24d6af9e@amd.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs