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

CONFIG_FSL_PCI (not configurable)

modulename: fsl_pci.ko

configname: CONFIG_FSL_PCI

Linux/PowerPC Kernel Configuration
└─>Bus options
└─>FSL_PCI
In linux kernel since version 2.6.23 (release Date: 2007-10-09)  
source code:
arch/powerpc/sysdev/fsl_pci.c