[rv_core_ibex] Re-vendor Ibex and reduce number of PRINCE rounds for ICache scrambling #22948
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This PR mainly reduced the number of PRINCE rounds for ICache scrambling to improve the timing. From a security perspective, this is acceptable. The scrambling of the other memory primitives (OTBN IMEM, DMEM, ROM etc.) is not touched.
To enable this change, Ibex needs to be re-vendored.
This is related to #22462.