qapi: do not protect enum values from namespace pollution

Enum values are always preceded by the uppercase name of the enum, so
they do not conflict with reserved words.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>

scripts/qapi-types.py

@@ -91,9 +91,9 @@ const char *%(name)s_lookup[] = {
 
 def generate_enum_name(name):
     if name.isupper():
-        return c_fun(name)
+        return c_fun(name, False)
     new_name = ''
-    for c in c_fun(name):
+    for c in c_fun(name, False):
         if c.isupper():
             new_name += '_'
         new_name += c