CONFIG_ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

Use bootloader kernel arguments if available

configname: CONFIG_ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER

Kernel command line type
└─>Use bootloader kernel arguments if available
In linux kernel since version 3.1 (release Date: 2011-10-24)  
Uses the command-line options passed by the boot loader instead of
the device tree bootargs property. If the boot loader doesn't provide
any, the device tree bootargs property will be used.