Temporary Enabling of Debug Features in uVisor

Please note that currently the latest version of uVisor (the `HEAD` of the `uvisor` repository) does not support the following features:
- LED blinking patterns
- Memory mapped debugging

This means that the support for hardware-specific debugging is temporarily unavailable. If you want to revert back to a version of uVisor that still supports those features, please checkout the `uvisor_with_memory_map_debug` branch:

``` bash
git clone --recursive -b uvisor_with_memory_map_debug git@github.com:ARMmbed/uvisor.git
```

This command will clone both `uvisor` and `uvisor-lib`. You can then build uVisor as usual, as reported in [the branch `README.md`](https://github.com/ARMmbed/uvisor/blob/uvisor_with_memory_map_debug/README.md).

Start with the issue's uvisor_with_memory_map_debug branch and its linked branch README.md, then compare that branch with the current HEAD. The issue identifies LED blinking patterns and memory mapped debugging as unavailable, but does not define an implementation scope or acceptance criteria, so the definition of done needs maintainer clarification.

Written by the indexing model from the issue text.