refactor(megbrain): combine mc40 and mc20 compnode and change mc20 to ax

GitOrigin-RevId: bcef8c6f040b97de3b287f9cbc07cc06aea6fa17

src/core/impl/comp_node/comp_node.cpp

@@ -154,6 +154,12 @@ CompNode::Locator CompNode::Locator::parse(const std::string& id) {
 
     // parse dev_type
             if (ptr[0] == 'a') {
+#if MGB_MC20
+        if (strncmp(ptr, "ax", 2) == 0) {
+            dev_type = DeviceType::AX;
+            ptr += 2;
+        } else {
+#endif
             if (strncmp(ptr, "atlas", 5)) {
                 err();
             }