Revert "Revert "drm/amdgpu: Fix warning of Function parameter or member not described""

This reverts commit 4e7b93ca.

Revert reason: The issue has been resolved.

Signed-off-by: Eric Huang <jinhuieric.huang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>