Merge my series [1] to deprecate the SLOB allocator.
- Renames CONFIG_SLOB to CONFIG_SLOB_DEPRECATED with deprecation notice.
- The recommended replacement is CONFIG_SLUB, optionally with the new
  CONFIG_SLUB_TINY tweaks for systems with 16MB or less RAM.
- Use cases that stopped working with CONFIG_SLUB_TINY instead of SLOB
  should be reported to linux-mm@kvack.org and slab maintainers,
  otherwise SLOB will be removed in few cycles.

[1] https://lore.kernel.org/all/20221121171202.22080-1-vbabka@suse.cz/