drm/amdgpu: distinct between allocated GART space and GMC addr
Most of the time we only need to know if the BO has a valid GMC addr. Signed-off-by: NChristian König <christian.koenig@amd.com> Reviewed-by: NJunwei Zhang <Jerry.Zhang@amd.com> Acked-by: NFelix Kuehling <Felix.Kuehling@amd.com> Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
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