Fix device string mismatch for Metax (maca) devices (flagos-ai#268)

Author: whollo

plugin/torch/flagcx/include/backend_flagcx.hpp

@@ -182,7 +182,7 @@ class flagcxBackend : public Backend {
 #elif USE_CAMBRICON_ADAPTOR
     devName = "mlu";
 #elif USE_METAX_ADAPTOR
-    devName = "maca";
+    devName = "cuda";
 #elif USE_MUSA_ADAPTOR
     devName = "musa";
 #elif USE_DU_ADAPTOR
@@ -230,4 +230,4 @@ class flagcxBackend : public Backend {
                                                Fn fn, OpType opType);
 };
 
-} // namespace c10d
+} // namespace c10d