drm/amdgpu: add EDC counter register

Add EDC counter register to support gfx9 gpr EDC workaround to
clear all EDC counters.

Signed-off-by: James Zhu <James.Zhu@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
1 file changed