CONFIG_CPU_V6K is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

CONFIG_CPU_V6K (not configurable)

modulename: proc-v6.ko

configname: CONFIG_CPU_V6K

Linux Kernel Configuration
└─>CPU_V6K
In linux kernel since version 2.6.39 (release Date: 2011-05-18)  
source code:
/arch/arm/mm/

is selected by
CONFIG_THUMB2_KERNEL

is depended by
CONFIG_ARCH_MULTI_V6