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

CONFIG_SAMSUNG_ATAGS (not configurable)

modulename: platformdata.ko

and/or

devs.ko

and/or

dev-uart.ko

configname: CONFIG_SAMSUNG_ATAGS

Linux Kernel Configuration
└─>SAMSUNG_ATAGS
In linux kernel since version 3.10 (release Date: 2013-06-30)  
This option enables ATAGS based boot support code for
Samsung platforms, including static platform devices, legacy
clock, timer and interrupt initialization, etc.

Platforms that support only DT based boot need not to select
this option.

source code: