Revert "[sonic-cfggen] make minigraph parser fail when speed and lane…

…s are not in PORT table (sonic-net#10228)"

This reverts commit cd330f0.

src/sonic-config-engine/sonic-cfggen

@@ -247,19 +247,6 @@ def _get_jinja2_env(paths):
 
     return env
 
-def _must_field_by_yang(data, table, must_fields):
-    """
-    Check if table contains must field based on yang definition
-    """
-    if table not in data:
-        return
-
-    for must_field in must_fields:
-        for _, fields in data[table].items():
-            if must_field not in fields:
-                print(must_field, 'is a must field in', table, file=sys.stderr)
-                sys.exit(1)
-
 def main():
     parser=argparse.ArgumentParser(description="Render configuration file from minigraph data and jinja2 template.")
     group = parser.add_mutually_exclusive_group()
@@ -354,8 +341,6 @@ def main():
                 deep_update(data, parse_xml(minigraph, platform, asic_name=asic_name))
         else:
             deep_update(data, parse_xml(minigraph, port_config_file=args.port_config, asic_name=asic_name, hwsku_config_file=args.hwsku_config))
-        # check if minigraph parser has speed and lanes in PORT table
-        _must_field_by_yang(data, 'PORT', ['speed', 'lanes'])
 
     if args.device_description is not None:
         deep_update(data, parse_device_desc_xml(args.device_description))