Unify TF-M and Mbed-SPM code generators:
- Unify SPM initialization logic:
- All partitions are registered at once
- Test partitions are guarded by #ifndef
- Introduce single template list
- Beatify template files and add "Autogen-do not modify" notice
Prepare for integration with mbed-os build system:
- Generate all the files in a single place
Simplify tools/psa/release.py script
- Move all PSA storage code under psa/storage directory
- Create a global PSA error codes header, eliminating ITS specific ones
- Create a common header file for PSA storage type definitions,
eliminating ITS specific ones
- Create a common implementation for PS & ITS
- Implement protected storage feature
- Change ITS test to be common to PS as well