Update file _3gpp-5gc-nrm-stmfunction.yang

  namespace urn:3gpp:sa5:_3gpp-5gc-nrm-stmfunction;

  prefix stm3gpp;

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

  import _3gpp-5g-common-yang-types { prefix types5g3gpp; }

  import _3gpp-common-top { prefix top3gpp; }

  import _3gpp-common-subnetwork { prefix subnet3gpp; }

  import ietf-inet-types { prefix inet; }

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

  organization "3gpp SA5";

  description "This IOC represents the STM function defined in 3GPP TS 28.abc.