CONFIG_PCI_XTALK_BRIDGE is not available for thedefaultarchitecture x86.
Result is shown for architecture mips

CONFIG_PCI_XTALK_BRIDGE (not configurable)

modulename: pci-xtalk-bridge.ko

configname: CONFIG_PCI_XTALK_BRIDGE

Linux Kernel Configuration
└─>PCI_XTALK_BRIDGE
In linux kernel since version 5.1 (release Date: 2019-05-05)  
source code:
arch/mips/pci/pci-xtalk-bridge.c
is depended by
CONFIG_SGI_IP27