[cryptolib] Deduplicate the `ibex` driver
@pamaury is already working on this.
Since Nov 4, 2025.
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Description
### Description
There are two ibex drivers:
- [silicon_creator driver](https://github.com/lowRISC/opentitan/blob/master/sw/device/silicon_creator/lib/drivers/ibex.h)
- [cryptolib driver](https://github.com/lowRISC/opentitan/blob/master/sw/device/lib/crypto/drivers/rv_core_ibex.h)
Also the silicon_creator has a [rnd driver](https://github.com/lowRISC/opentitan/blob/master/sw/device/silicon_creator/lib/drivers/rnd.h).
The following items (at least) should be looked at:
- [ ] [`ibex_rnd32_read`](https://github.com/lowRISC/opentitan/blob/master/sw/device/lib/crypto/drivers/rv_core_ibex.h#L55): move to silicon_creator
- [ ] [`ibex_{enable,disable}_icache`](https://github.com/lowRISC/opentitan/blob/master/sw/device/lib/crypto/drivers/rv_core_ibex.h#L24): move to silicon_creator
- [ ] [`ibex_check_security_config`](https://github.com/lowRISC/opentitan/blob/master/sw/device/lib/crypto/drivers/rv_core_ibex.h#L45): keep in cryptolib
- [ ] [`ibex_clear_rf`](https://github.com/lowRISC/opentitan/blob/master/sw/device/lib/crypto/drivers/rv_core_ibex.h#L70): keep in cryptolib
- [ ] create `ibex` mock
- [ ] expand `ibex` unittest
- [ ] maybe turn [the cryptolib rv_core_ibex mock into a real mock](https://github.com/lowRISC/opentitan/blob/master/sw/device/lib/crypto/drivers/mock_rv_core_ibex.cc)
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