CONFIG_S3C2440_XTAL_16934400 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

CONFIG_S3C2440_XTAL_16934400 (not configurable)

configname: CONFIG_S3C2440_XTAL_16934400

Linux Kernel Configuration
└─>SAMSUNG S3C24XX SoCs Support
└─>S3C2440_XTAL_16934400
In linux kernel since version 2.6.32 (release Date: 2009-12-02)  
Indicate that the build needs to support 16.9344MHz system
crystal.