default or selected kernelversion does not have config value CONFIG_MIGRATE_VMA_HELPER.
Result is shown for kernelversion 6.9.9

CONFIG_MIGRATE_VMA_HELPER (not configurable)

configname: CONFIG_MIGRATE_VMA_HELPER

Linux Kernel Configuration
└─>Memory Management options
└─>MIGRATE_VMA_HELPER
In linux kernel since version 3.10 (release Date: 2013-06-30)