Upstream Chimera features

[sermazz]

This merges #89 and #99

• up-to-date dmac_wrap for iDMA
• Parametrizable wide AXI port to route iDMA requests to outer world (instead of going through the narrow cluster bus and narrow AXI ports)
• Multiple HWPE support for HCI
• iDMA transfers to/from TCDM can now go through wide HWPEs port of TCDM

Important notes

• HCI and Neureka dependencies now point to the upstream main versions (with our updates), rather than to the Astral-specific versions with hardcoded ECC features. This would require manual merge if desired
• ECC and HMR features and testing are disabled due to the point above (both in hw and sw)
• Many features are difficult to test in multiple configurations in the CI, e.g., even if the type/number of HWPE is easily parametrizable, those parameters do not propagate to runtime and regression tests, which need different revisions to correctly test different hardware configurations. In this PR we only test one configuration (e.g., only Neureka, no other HWPEs, no ECC features and fault testing, ...), overwriting the one from Astral. We should figure out a way to facilitate this.

To do

• Rebase our fixes to HCI and Neureka on their respective main and use those revisions:
  • Fix FIFO delay parameter propagation in HCI hci#63
  • bump to HCI commit: add multi-cycle support in HCI neureka#36
• Clean up commit history
• Rebase our nonfree repo on the latest one and get backend regression tests
• Rebase pulp runtime and regression tests on latest version, find a way to merge with Astral's?

@DanielKellerM