CONFIG_PPC_MPC106 is not available for thedefaultarchitecture x86.
Result is shown for architecture powerpc

CONFIG_PPC_MPC106 (not configurable)

modulename: grackle.ko

configname: CONFIG_PPC_MPC106

Linux/PowerPC Kernel Configuration
└─>Platform support
└─>PPC_MPC106
In linux kernel since version 2.6.15 (release Date: 2006-01-02)  
source code:
arch/powerpc/sysdev/grackle.c