[base] Adjust hardening primitives to use function pointers for randomness. #27141
Description
As discussed in SW WG (see #27061 (comment) for summary).
This will require:
- Adding a function that can access Ibex RND to cryptolib
- Adding a function that can access Ibex RND to the silicon_creator drivers
- Adjusting all current call sites of hardening primitives in the repo to pass these functions as pointers.