default or selected kernelversion does not have config value CONFIG_SPECTRE_BHI_AUTO.
Result is shown for kernelversion 6.8.6

auto

configname: CONFIG_SPECTRE_BHI_AUTO

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└─>auto
In linux kernel since version 5.15.154 (release Date: 2024-04-10)  
Equivalent to setting spectre_bhi=auto command line parameter.