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

CONFIG_FSL_IFC (not configurable)

modulename: fsl_ifc.ko

configname: CONFIG_FSL_IFC

Linux Kernel Configuration
└─>Bus options
└─>FSL_IFC
In linux kernel since version 3.1 (release Date: 2011-10-24)  
source code:
depends
CONFIG_FSL_SOC

is depended by
CONFIG_MTD_NAND_FSL_IFC