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Previously, TAU procedure validated EPS Bearer Context Status (BCS)
only when active_flag == 0. When active_flag == 1, the MME skipped BCS
validation and sent TAU ACCEPT directly via InitialContextSetup.
This patch unifies BCS validation so both active_flag paths handle
bearer mismatches consistently. It also selects the correct S1AP
procedure (InitialContextSetup or DownlinkNASTransport) depending on
the UE active state.
Changes:
- emm-sm.c / sgsap-handler.c:
* Always check EPS_BEARER_CONTEXT_STATUS_TYPE presence.
* Invoke mme_send_delete_session_or_tau_accept() for both
active_flag=0 and 1.
* Send TAU ACCEPT directly only when BCS is not present.
- mme-path.c:
* Select S1AP procedure in TAU ACCEPT based on active_flag.
- mme-s11-handler.c:
* After Delete Session Response (OGS_GTP_DELETE_SEND_TAU_ACCEPT),
send TAU ACCEPT using proper S1AP procedure by active_flag.
This aligns MME TAU behavior with 3GPP TS 24.301 section 5.3.3.0a,
ensuring consistent BCS synchronization regardless of UE activity.
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