default or selected kernelversion does not have config value CONFIG_ACPI_LEGACY_TABLES_LOOKUP.
Result is shown for kernelversion 6.9-rc4

CONFIG_ACPI_LEGACY_TABLES_LOOKUP (not configurable)

configname: CONFIG_ACPI_LEGACY_TABLES_LOOKUP

Linux Kernel Configuration
└─>Power management and ACPI options
└─>ACPI (Advanced Configuration and Power Interface) Support
└─>ACPI_LEGACY_TABLES_LOOKUP
In linux kernel since version 4.2 (release Date: 2015-08-30)  
depends
CONFIG_ACPI