drm/amdgpu: fix the gart table cleared issue for S3

Something writes over the first 8 MB so reserve this
on vega10 until we root cause it.

Signed-off-by: Huang Rui <ray.huang@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.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 96cbe02..ef34ff2 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -607,6 +607,7 @@ struct amdgpu_mc {
 	uint32_t                srbm_soft_reset;
 	struct amdgpu_mode_mc_save save;
 	bool			prt_warning;
+	uint64_t		stolen_size;
 	/* apertures */
 	u64					shared_aperture_start;
 	u64					shared_aperture_end;