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

PCI support

modulename: pci.ko

and/or

pci_v3.ko

and/or

pci-quirks.ko

and/or

pcic.ko

and/or

ebus.ko

and/or

bios32.ko

and/or

m1535plus.ko

and/or

pci-dma.ko

and/or

pci_auto.ko

and/or

mpc52xx_pci.ko

and/or

apus_pci.ko

and/or

early-quirks.ko

configname: CONFIG_PCI

Linux/PowerPC Kernel Configuration
└─>Bus options
└─>PCI support
In linux kernel since version 2.6.12  
Find out whether your system includes a PCI bus. PCI is the name of
a bus system, i.e. the way the CPU talks to the other stuff inside
your box. If you say Y here, the kernel will include drivers and
infrastructure code to support PCI bus devices.