drm/amdgpu: only enable swiotlb alloc when need v2
get the max io mapping address of system memory to see if it is over our card accessing range. v2: move checking later Signed-off-by: NChunming Zhou <david1.zhou@amd.com> Reviewed-by: NMonk Liu <monk.liu@amd.com> Reviewed-by: NChristian König <christian.koenig@amd.com> Signed-off-by: NAlex Deucher <alexander.deucher@amd.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180209024410.1469-2-david1.zhou@amd.com
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