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Add Wi-Fi Aware group-key support to secured NDPs so group-addressed traffic can be protected, for interop with iOS/macOS peers: - GTK (NCS-GTK-CCM-128) protects group-addressed data. - IGTK/BIGTK (BIP) protect group management traffic - multicast SDFs, Beacons. Capabilities are advertised in the CSIA IE: group_data_prot maps to GTKSA, group_mgmt_prot to IGTKSA/BIGTKSA. The CSIA cannot encode IGTK/BIGTK without GTK (WiFi Aware spec 9.5.21.2, Table 122), so enabling group_mgmt_prot forces group_data_prot on for every secured service. Expose per-service group_data_prot and device-global group_mgmt_prot.