These are the System DMA register headers for vega20.

v2: cleanups (Alex)
v3: add missing licenses (Alex)
Signed-off-by: Feifei Xu <Feifei.Xu@amd.com>
Acked-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>