generate_params.py: fix parse_yaml_parameters_config

Correctly handle multiple parameter sections

Tools/module_config/generate_params.py

@@ -40,11 +40,11 @@ def parse_yaml_parameters_config(yaml_config, ethernet_supported):
     if 'parameters' not in yaml_config:
         return ''
     parameters_section_list = yaml_config['parameters']
+    ret = ''
     for parameters_section in parameters_section_list:
         if 'definitions' not in parameters_section:
-            return ''
+            continue
         definitions = parameters_section['definitions']
-        ret = ''
         param_group = parameters_section.get('group', None)
         for param_name in definitions:
             param = definitions[param_name]