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

CONFIG_AS_HAS_LSE_ATOMICS (not configurable)

configname: CONFIG_AS_HAS_LSE_ATOMICS

Linux Kernel Configuration
└─>Kernel Features
└─>ARMv8.1 architectural features
└─>AS_HAS_LSE_ATOMICS
In linux kernel since version 5.2 (release Date: 2019-07-07)  
is selected by
CONFIG_ARM64_MTE