Add gfx90a target (#344)

* Add gfx90a target

* Support gfx90a topology

Co-authored-by: Eiden Yoshida <eiden.yoshida@amd.com>

[ROCm/rccl commit: 1fe031402a]

projects/rccl/tools/topo_expl/topo_expl.cpp

@@ -121,6 +121,7 @@ NodeModelDesc model_descs[] = {
   {4, "topo_8p_rome_4nics.xml", "4 nodes node 8 gfx908 Rome 4 NICs"},
   {4, "topo_collnet_n1.xml",    "4 nodes collnet 1 NICs"},
   {4, "topo_collnet_n4.xml",    "4 nodes collnet 4 NICs"},
+  {1, "topo_8p_90a.xml",        "single node gfx90a"},
 };
 
 int main(int argc,char* argv[])