CONFIG_CPU_PJ4B is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

CONFIG_CPU_PJ4B (not configurable)

modulename: pj4-cp0.ko

configname: CONFIG_CPU_PJ4B

Linux Kernel Configuration
└─>CPU_PJ4B
In linux kernel since version 3.1 (release Date: 2011-10-24)  
source code:
arch/arm/kernel/pj4-cp0.c
selects
CONFIG_CPU_V7

is depended by
CONFIG_MACH_MMP3_DT