Just everything you need for UVD with r600g and radeonsi.
v2: move UVD code to radeon subdir, clean up build system additions,
remove an unused SI function, disable tiling on SI for now.
v3: some minor indentation fix and rebased
v4: dpb size calculation fixed
v5: implement proper fall-back in case the kernel doesn't support UVD,
based on patches from Andreas Boll but cleaned up a bit more.
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>