drm/amdgpu/gfx8: add state setup for CZ/ST GFX power gating
This sets up the CP jump table and GDS buffer and sets the
PG state registers.
Signed-off-by: 
Alex Deucher <alexander.deucher@amd.com>
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This sets up the CP jump table and GDS buffer and sets the
PG state registers.
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>