CONFIG_SPARC_GRPCI1 is not available for thedefaultarchitecture x86.
Result is shown for architecture sparc

GRPCI Host Bridge Support

modulename: leon_pci_grpci1.ko

configname: CONFIG_SPARC_GRPCI1

Linux Kernel Configuration
└─>Bus options (PCI etc.)
└─>GRPCI Host Bridge Support
In linux kernel since version 3.1 (release Date: 2011-10-24)  
Say Y here to include the GRPCI Host Bridge Driver. The GRPCI
PCI host controller is typically found in GRLIB SPARC32/LEON
systems. The driver has one property (all_pci_errors) controlled
from the bootloader that makes the GRPCI to generate interrupts
on detected PCI Parity and System errors.

source code:
depends
CONFIG_LEON_PCI