python: Fix namespaced enums params code generation

The wrapper_name parameter was not properly handled. Enums were always
generated in the enums namespace even if required differently by
wrapper_name.

Change-Id: I366846ce39dfe10effc2cc145e7772a3fd171b92
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/67662
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Bobby Bruce <bbruce@ucdavis.edu>
Maintainer: Bobby Bruce <bbruce@ucdavis.edu>

build_tools/enum_cc.py

@@ -97,7 +97,7 @@ const char *${name}Strings[static_cast<int>(${name}::Num_${name})] =
         )
     else:
         code(
-            """namespace enums
+            """namespace ${wrapper_name}
 {"""
         )
         code.indent(1)
@@ -112,7 +112,7 @@ code("};")
 
 if not enum.wrapper_is_struct and not enum.is_class:
     code.dedent(1)
-    code("} // namespace enums")
+    code("} // namespace ${wrapper_name}")
 
 code("} // namespace gem5")