drm/amdgpu: add comments in ras interrupt callback

add comments to clarify why checking GFX IP BLOCK for each ras interrupt callback

Signed-off-by: Tao Zhou <tao.zhou1@amd.com>
Reviewed-by: Guchun Chen <guchun.chen@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
3 files changed