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selftests/bpf: Fix pyperf180 compilation failure with clang18

jira LE-2125
commit-author Yonghong Song <[email protected]>
commit 100888f

To workaround the issue, previously all 180 loop iterations are fully unrolled.
The bpf macro __BPF_CPU_VERSION__ (implemented in clang18 recently) is used to avoid
unrolling changes if cpu=v4. If __BPF_CPU_VERSION__ is not available and the
compiler is clang18, the unrollng amount is unconditionally reduced.

[1] llvm/llvm-project@1a2e77c

        Signed-off-by: Yonghong Song <[email protected]>
        Signed-off-by: Andrii Nakryiko <[email protected]>
        Tested-by: Alan Maguire <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]
(cherry picked from commit 100888f)
        Signed-off-by: Brett Mastbergen <[email protected]>

Author: gvrose8192

Documentation/intel_txt.txt

@@ -225,3 +225,5 @@ any other macrocode and its correct operation is critical to the
 establishment of the DRTM.  The process for determining the correct
 SINIT ACM for a system is documented in the SINIT-guide.txt file
 that is on the tboot SourceForge site under the SINIT ACM downloads.
+
+Add a minor change to force PR checker