hardening updates for v6.9-rc1

- string.h and related header cleanups (Tanzir Hasan, Andy Shevchenko)

- VMCI memcpy() usage and struct_size() cleanups (Vasiliy Kovalev, Harshit
  Mogalapalli)

- selftests/powerpc: Fix load_unaligned_zeropad build failure (Michael
  Ellerman)

- hardened Kconfig fragment updates (Marco Elver, Lukas Bulwahn)

- Handle tail call optimization better in LKDTM (Douglas Anderson)

- Use long form types in overflow.h (Andy Shevchenko)

- Add flags param to string_get_size() (Andy Shevchenko)

- Add Coccinelle script for potential struct_size() use (Jacob Keller)

- Fix objtool corner case under KCFI (Josh Poimboeuf)

- Drop 13 year old backward compat CAP_SYS_ADMIN check (Jingzi Meng)

- Add str_plural() helper (Michal Wajdeczko, Kees Cook)

- Ignore relocations in .notes section

- Add comments to explain how __is_constexpr() works

- Fix m68k stack alignment expectations in stackinit Kunit test

- Convert string selftests to KUnit

- Add KUnit tests for fortified string functions

- Improve reporting during fortified string warnings

- Allow non-type arg to type_max() and type_min()

- Allow strscpy() to be called with only 2 arguments

- Add binary mode to leaking_addresses scanner

- Various small cleanups to leaking_addresses scanner

- Adding wrapping_*() arithmetic helper

- Annotate initial signed integer wrap-around in refcount_t

- Add explicit UBSAN section to MAINTAINERS

- Fix UBSAN self-test warnings

- Simplify UBSAN build via removal of CONFIG_UBSAN_SANITIZE_ALL

- Reintroduce UBSAN's signed overflow sanitizer
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