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

IBM PowerNV (Non-Virtualized) platform support

modulename: ics-opal.ko

configname: CONFIG_PPC_POWERNV

Linux Kernel Configuration
└─>IBM PowerNV (Non-Virtualized) platform support
In linux kernel since version 3.1 (release Date: 2011-10-24)  
source code:
arch/powerpc/sysdev/xics/ics-opal.c