feat: Bump CVA6 for OpenPiton, fix mmu issues

Created by: tianrui-wei

This PR does the following

1. Bump the filelist for OpenPiton for new directory layout
2. Remove AXI Interface for OpenPiton in the top level
3. Fix several issues in MMU discovered during address translation last year, the changes in core/mmu_sv39/mmu.sv are a joint effort between Jbalkind minho-pulp zarubaf niwis acostillado tianrui-wei (removing github @ to avoid spamming everyone)
4. disable bitmanip by default
5. separate an ariane config package for openpiton synthesis. Some of the previous changes makes ariane too big for openpiton, so we need to revert these changes
6. Don't increase number of writeback ports (NR_WB_PORTS) when cvxif is not enabled

Signed-off-by: Tianrui Wei tianrui@tianruiwei.com