CONFIG_ARM64_BTI_KERNEL is not available for thedefaultarchitecture x86.
Result is shown for architecture arm64

Use Branch Target Identification for kernel

configname: CONFIG_ARM64_BTI_KERNEL

Linux Kernel Configuration
└─>Kernel Features
└─>ARMv8.5 architectural features
└─>Use Branch Target Identification for kernel
In linux kernel since version 4.14.326 (release Date: 2023-09-23)  
Build the kernel with Branch Target Identification annotations
and enable enforcement of this for kernel code. When this option
is enabled and the system supports BTI all kernel code including
modular code must have BTI enabled.