liteeth_gen: Add optional name parameter to configure generated veril…

…og name.

liteeth/gen.py

@@ -639,7 +639,7 @@ def main():
         builder_arguments["csr_csv"] = os.path.join(builder_arguments["output_dir"], "csr.csv")
 
     builder = Builder(soc, **builder_arguments)
-    builder.build(build_name="liteeth_core")
+    builder.build(build_name=core_config.get("name", "liteeth_core"))
 
 if __name__ == "__main__":
     main()