CONFIG_S3C2443_CLOCK is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

CONFIG_S3C2443_CLOCK (not configurable)

modulename: s3c2443-clock.ko

configname: CONFIG_S3C2443_CLOCK

Linux Kernel Configuration
└─>S3C2443_CLOCK
In linux kernel since version 2.6.35 (release Date: 2010-08-01)  
Clock code for the S3C2443 and similar processors, which includes
the S3C2416 and S3C2450.

source code:
/arch/arm/plat-s3c24xx/s3c2443-clock.c