drm/amd: make a type-safe cgs_device struct. (v2)

This is just a type-safety things to avoid everyone taking void *,
it doesn't change anything.

v2: agd5f: split out the dal changes into a separate patch.

Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index c9fe2d5..a7a53ac 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -1868,15 +1868,8 @@
 /*
  * CGS
  */
-void *amdgpu_cgs_create_device(struct amdgpu_device *adev);
-void amdgpu_cgs_destroy_device(void *cgs_device);
-
-
-/*
- * CGS
- */
-void *amdgpu_cgs_create_device(struct amdgpu_device *adev);
-void amdgpu_cgs_destroy_device(void *cgs_device);
+struct cgs_device *amdgpu_cgs_create_device(struct amdgpu_device *adev);
+void amdgpu_cgs_destroy_device(struct cgs_device *cgs_device);
 
 
 /* GPU virtualization */