drm/amdgpu: use node_id and node_size to calcualte dram_base_address
physical_node_id * node_segment_size should be the dram_base_address for current gpu node in xgmi config Signed-off-by: NHawking Zhang <Hawking.Zhang@amd.com> Reviewed-by: NJohn Clements <john.clements@amd.com> Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
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