CONFIG_PPC_I8259 is not available for thedefaultarchitecture x86.
Result is shown for architecture powerpc

CONFIG_PPC_I8259 (not configurable)

modulename: i8259.ko

configname: CONFIG_PPC_I8259

Linux Kernel Configuration
└─>Platform support
└─>PPC_I8259
In linux kernel since version 2.6.15 (release Date: 2006-01-02)  
source code:
arch/powerpc/sysdev/i8259.c