issue: 3690535 Remove SO_XLIO_RING_USER_MEMORY

[pasis]

Description

This is leftover from the Multi Packet RQ removal. In current code, this option doesn't have effect and only wastes 96 bytes per socket.

Also, reduce ring_allocation_logic size (64 bytes per socket).

What

Remove SO_XLIO_RING_USER_MEMORY and related code.

Why ?

Code cleanup and reduce socket size.

Change type

What kind of change does this PR introduce?

• [ ] Bugfix
• [ ] Feature
• [ ] Code style update
• [x] 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)

[AlexanderGrissik]

Lets remove remove opaque and print pointer to this in to_str and constructor

[pasis]

Lets remove remove opaque and print pointer to this in to_str and constructor

Done.