Update lowrisc_ibex to lowRISC/ibex@123d46b4

[vogelpi]

Update code from upstream repository
https://github.com/lowRISC/ibex.git to revision
123d46b4d60068502f80c117772a279db12f5af7

• [dv] Fix paths in merge_cov.py (Sᴜᴘᴇʀ Lᴇᴇ)
• Tweak questa timescale argument (Harry Callahan)
• Fixup the questa build/sim command templates in rtl_simulation.yaml (Harry Callahan)
• [rtl] Fix FI vulnerability in RF (Pascal Nasahl)
• [doc] Update cosim version (Pascal Nasahl)
• [util] Update check_tool_requirements.py (Gary Guo)
• [rtl] Avoid name collision in ibex_pmp.sv (Rupert Swarbrick)
• [dv] Fix performance counter printing in simple system (Rupert Swarbrick)
• Fix spelling of separator (Rupert Swarbrick)
• [dv] Add an extra key to common_project_cfg.hjson (Rupert Swarbrick)
• [verilator] Slight refactor in ibex_tracer to avoid BLKSEQ warning (Rupert Swarbrick)
• [verilator] Waive MULTIDRIVEN warning in ibex_tracer.sv (Rupert Swarbrick)
• [ibex_pmp/lint] Declare functions before using them (Michael Schaffner)
• Update google_riscv-dv to chipsalliance/riscv-dv@71666eb (Greg Chadwick)
• [dv] Fix ibex_cmd.py (Greg Chadwick)
• Port directed_test_schema.py to recent versions of Pydantic (Rupert Swarbrick)
• Tweak ibex_cmd.py to fail more cleanly (Rupert Swarbrick)
• Remove (empty) Verible waiver file (Rupert Swarbrick)
• [doc] Fix background of Icache block (Marno van der Maas)
• [doc] Fix background in block diagram (Marno van der Maas)
• Update google_riscv-dv to chipsalliance/riscv-dv@08b1206 (Marno van der Maas)
• [dv,doc] Point reference to lowRISC branch (Marno van der Maas)
• [dv] Move DVSIM data structures (Marno van der Maas)
• [dv] Add common_ifs_pkg.sv to DV files (Marno van der Maas)
• [doc] Fix documented mstatus reset value (Greg Chadwick)
• [dv] New directed test to cover some scenarios with U-mode execution (Greg Chadwick)
• [dv] Fix SET_PMP_CFG macro used by directed tests (Greg Chadwick)
• [dv,fcov] Add additional illegal bins to PMP fcov (Greg Chadwick)
• [dv, fcov] Increase iterations of riscv_mem_intg_error_test (Greg Chadwick)
• Use correct format string for $value$plusargs (Rupert Swarbrick)
• Reorder classes in ibex_debug_triggers_overrides.sv (Rupert Swarbrick)
• Express some coverpoint crosses in an equivalent way (Rupert Swarbrick)
• Drop an import from inside of a class (Rupert Swarbrick)
• Re-export imported symbols from ibex_mem_intf_pkg (Rupert Swarbrick)
• Bump Spike minimum version (Rupert Swarbrick)
• Correct type in scripts_lib.py's run_one (Rupert Swarbrick)
• [dv] Add asserts to check alerts for memory integrity failures (Greg Chadwick)
• Drop a double entry in rtl_simulation.yaml (Rupert Swarbrick)

[vogelpi]

This is currently a draft / placeholder PR to make sure the register file FI vulnerability fix of @nasahlpa makes it's way into master. We should check.

This is related to #20715.

[vogelpi]

Closing in favor of #20890 .