Allow upgrading ACPI tables via initrd

configname: CONFIG_ACPI_TABLE_UPGRADE

Linux Kernel Configuration
└─>Power management and ACPI options
└─>ACPI (Advanced Configuration and Power Interface) Support
└─>Allow upgrading ACPI tables via initrd
In linux kernel since version 4.2 (release Date: 2015-08-30)  
This option provides functionality to upgrade arbitrary ACPI tables
via initrd. No functional change if no ACPI tables are passed via
initrd, therefore it's safe to say Y.
See Documentation/admin-guide/acpi/initrd_table_override.rst for details

depends
CONFIG_ACPI
CONFIG_ARCH_HAS_ACPI_TABLE_UPGRADE
CONFIG_BLK_DEV_INITRD