The build file in this directory contains targets for various options for kernel command-line arguments.
These arguments should be passed via the relevant GN arguments:
board_bootfs_labels (from //build/board.gni) in a board file;product_bootfs_labels (from //build/product.gni) in a product file;dev_bootfs_labels (from //build/dev.gni) in an fx set and gn gen invocation.