Refactor NAS 5GS Registration Request generation (3GPP TS 24.501)
* send integrity protected Initial NAS Message when UE in 5GMM-IDLE mode has valid current 5G NAS security context: > According to 4.4.2.5 TS 24.501: > when a UE in 5GMM-IDLE mode establishes a new NAS signalling connection and has a valid current 5G NAS > security context, the UE shall transmit the initial NAS message integrity protected with the current 5G NAS security > context and further protect this message as specified in subclause 4.4.6. * set NAS key set identifier IE to "no key is available (UE to network)" * previously set to 1 which has no impact * set now to 111 in order to trigger new authentication * See 9.11.3.32 of 3GPP TS 24.501 * Do 5GS Registration Type "mobility registration updating" when 5GMM state is De-registered
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