Cleanup CPU core instance configuration about tillitis-key1

[secworks]

I've created the https://github.com/tillitis/tillitis-key1/tree/cpu_configuration branch for work, and made a first stab at the clean up. However I should compare our configuration with the defaults in the CPU source code, not the documentation.

[secworks]

The results from first attempt was not good. The core expanded. Deleted the branch mentioned above and create a new one. https://github.com/tillitis/tillitis-key1/tree/cpu_config_cleanup

[secworks]

The new branch contains a commit that removes options in the instance that are the same as what the core has as defaults. This should be 100% benign. Interestingly, disabling ENABLE_COUNTERS64 make the core grow with one LC. We therefore keep that option enabled (is enabled as desfault). (Enabling counters makes the core grow with many LCs.)

The commit:
317561a

[secworks]

The commit has been merged into main.