[DOCA] Add doca_mmap support for memory registration

[iftahl]

Based on PR154.

Adding doca_mmap support:

1. Accessed by get_doca_mmap().
2. Add doca_mmap support for sendfile.
3. Still using lkey by ibv mem_reg to allow traffic during integration.

Change type

What kind of change does this PR introduce?

• [ ] Bugfix
• [x] Feature
• [ ] Code style update
• [ ] Refactoring (no functional changes, no api changes)
• [ ] Build related changes
• [ ] CI related changes
• [ ] Documentation content changes
• [ ] Tests
• [ ] Other

Check list

• [ ] Code follows the style de facto guidelines of this project
• [ ] Comments have been inserted in hard to understand places
• [ ] Documentation has been updated (if necessary)
• [ ] Test has been added (if possible)