Function combineSecurityControl

05-3474-23 R23.1, Figure 4-25 (Security control field)

SPEC COMPLIANCE NOTES:

• ✅ Packs security level, key identifier, and nonce flag per Zigbee bit layout
• ✅ Supports temporary level override for CCM* calculations
• ⚠️ Caller responsible for ensuring override matches actual MIC length in use DEVICE SCOPE: All logical devices