Add VCS simulation flow

[CyrilKoe]

This required two changes:
AXI : pulp-platform/axi@6879518
iDMA: pulp-platform/iDMA@1af5451

• cheshire_pkg.sv
  • VCS: Support for parameter of type 'DefaultMapEntry' inside 'Function' is not yet implemented
• vip_cheshire_soc.sv
  • @(negedge rst_n) is not detected by VCS as rst_n is de-asserted at delta 0.
  • streams require explicit cast to string
  • concatenation of interfaces using { } is not in the standard
  • removed logic for gate level (see example module tri_latch page 857 of IEEE Std 1800™-2023)