CONFIG_XICS is not available for thedefaultarchitecture x86.
Result is shown for architecture powerpc
default or selected kernelversion does not have config value CONFIG_XICS.
Result is shown for kernelversion 5.4.69

CONFIG_XICS (not configurable)

modulename: xics.ko

configname: CONFIG_XICS

Linux Kernel Configuration
└─>Platform support
└─>XICS
In linux kernel since version 2.6.15 (release Date: 2006-01-02)  
source code:
arch/powerpc/platforms/pseries/xics.c

is depended by
CONFIG_PPC_PSERIES