[manuf] reduce code size of provisioning binaries
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Description
### Description
To optimize provisioning performance, the code sizes of the provisioning binaries below should be reduced:
1. CP init
2. FT individualize
3. FT personalize
One potential strategy to reduce code size is to refactor the provisioning [libraries](https://github.com/lowRISC/opentitan/tree/master/sw/device/silicon_creator/manuf/lib) to silicon_creator drivers instead of DIFs and testutils. Other strategies should be investigated as well.
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reading the provisioning libraries in sw/device/silicon_creator/manuf/lib and identify how CP init, FT individualize, and FT personalize use DIFs and testutils. Investigate the proposed silicon_creator-driver refactor alongside other size-reduction strategies, then verify that all three provisioning binaries are smaller; the issue does not specify target sizes.
Written by the indexing model from the issue text.
Assessment
- Domain
- embedded-iot, security
- Issue type
- Refactor
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 25/100