selftests/futex: Migrate functional tests to harness

Currently, multiple futex functional tests (wait_timeout, waitv,
wait_wouldblock) mix low-level ksft_* logging and result APIs with the
kselftest_harness.h framework. On older kernels where system calls like
futex_waitv are missing (returning -ENOSYS), this mixed usage triggers
framework inconsistencies, causing the test to fail with: "Illegal usage of
low-level ksft APIs in harness test".

Address this by completely refactoring these tests to exclusively use
the high-level kselftest_harness.h framework (gtest-like API), mapping
all low-level calls to native harness macros:

  - Non-fatal assertions: Replace ksft_test_result_fail() with EXPECT_EQ()
    and EXPECT_NE().

  - Fatal assertions: Replace ksft_exit_fail_msg() with ASSERT_EQ() and
    ASSERT_TRUE() to immediately terminate execution upon setup failure.

  - Test skipping: Replace ksft_exit_skip() with the graceful SKIP() macro
    combined with early runtime availability checks for sys_futex_waitv.

  - Debug logging: Replace ksft_print_dbg_msg() with TH_LOG() to inherit
    automatic file/line context.

  - Success reporting: Remove explicit ksft_test_result_pass() calls,
    deferring to automated harness completion reporting.

Additionally:

  - Fix a critical SIGSEGV crash in early syscall probing logic caused by
    passing a NULL pointer to inline user-space timespec conversions.

  - Introduce TEST_TIMEOUT() and GET_ABS_TIMEOUT() macros in wait_timeout
    to encapsulate assertions while preserving source line attribution.

  - Pass test metadata (_metadata) into secondary threads to allow native
    harness assertions during concurrent execution.

[ tglx: Fixup coding style ]

Signed-off-by: Wake Liu <wakel@google.com>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Link: https://patch.msgid.link/20260526010635.23980-2-wakel@google.com

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