linux-kselftest-next-5.15-rc1

This Kselftest update for Linux 5.15-rc1 consists of fixes to build
and test failures.

-- openat2 test failure for O_LARGEFILE flag on ARM64
-- x86 test build failures related to glibc 2.34 adding
   support for variable sized MINSIGSTKSZ and SIGSTKSZ
-- removing obsolete configs in sync and cpufreq config files
-- minor spelling and duplicate header include cleanups
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