CONFIG_PPC_CHRP is not available for thedefaultarchitecture x86.
Result is shown for architecture powerpc

Common Hardware Reference Platform (CHRP) based machines

modulename: chrp_smp.ko

and/or

chrp_setup.ko

and/or

open_pic.ko

configname: CONFIG_PPC_CHRP

Linux/PowerPC Kernel Configuration
└─>Platform support
└─> Common Hardware Reference Platform (CHRP) based machines
In linux kernel since version 2.6.15 (release Date: 2006-01-02)  
source code:
arch/ppc/syslib/open_pic.c


is selected by
CONFIG_I2C_HYDRA