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

CONFIG_PLAT_VERSATILE_CLOCK (not configurable)

modulename: clock.ko

configname: CONFIG_PLAT_VERSATILE_CLOCK

Linux Kernel Configuration
└─>PLAT_VERSATILE_CLOCK
In linux kernel since version 3.1 (release Date: 2011-10-24)  
source code:
arch/arm/plat-versatile/clock.c