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_acp.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_acp.h
index f6e32a6..8a39631 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_acp.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_acp.h
@@ -30,7 +30,7 @@
 
 struct amdgpu_acp {
 	struct device *parent;
-	void *cgs_device;
+	struct cgs_device *cgs_device;
 	struct amd_acp_private *private;
 	struct mfd_cell *acp_cell;
 	struct resource *acp_res;