Update _3gpp-common-filemanagement.yang

  import _3gpp-common-yang-types { prefix types3gpp; }

  import _3gpp-common-yang-extensions { prefix yext3gpp; }

  import _3gpp-common-managed-element { prefix me3gpp; }

  import ietf-inet-types { prefix inet; }

  organization "3GPP SA5";

  contact "https://www.3gpp.org/DynaReport/TSG-WG--S5--officials.htm?Itemid=464";