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

CONFIG_PPC_XICS (not configurable)

configname: CONFIG_PPC_XICS

Linux Kernel Configuration
└─>PPC_XICS
In linux kernel since version 3 (release Date: 2011-07-21)  

is depended by
CONFIG_PPC_POWERNV