Returns the level of tracing that the trace unit can support
| NSID | Indicates whether the trace unit supports Non-secure invasive debug: |
| NSNID | Indicates whether the system enables the trace unit to support Non-secure non-invasive debug: |
| SID | Indicates whether the trace unit supports Secure invasive debug: |
| SNID | Indicates whether the system enables the trace unit to support Secure non-invasive debug: |