[HW] cva6: Increase AXI data width

[niwis]

Set Ariane's AXI data width to its data cache width (currently 512 bit)

Changelog

Changed

• Update to CVA6 version with parametrised AXI data width
• Separate AXI types for Ariane and Peripherals (so that the data widths are independent)

Checklist

• [x] Automated tests pass
• [ ] Changelog updated
• [x] Code style guideline is observed

[suehtamacv]

@mp-17 Can we merge this? I guess it is more of a question of, is this the configuration you used for ASAP?

[mp-17]

Let's rebase this, modify the changelog, and launch a backend run!