default or selected kernelversion does not have config value CONFIG_ACPI_MRRM.
Result is shown for kernelversion 6.16-rc7

CONFIG_ACPI_MRRM (not configurable)

configname: CONFIG_ACPI_MRRM

Linux Kernel Configuration
└─>Power management and ACPI options
└─>ACPI (Advanced Configuration and Power Interface) Support
└─>ACPI_MRRM
In linux kernel since version 6.1.145 (release Date: 2025-07-14)  
depends
CONFIG_ACPI

is depended by
CONFIG_X86_64