linux-phytec-ti

PCI: keystone: Prevent ARM32 specific code to be compiled for ARM64

hook_fault_code is an ARM32 specific API for hooking into data abort.
Since pci-keystone.c will be used for AM65X platforms which is an
ARM64 platform, allow hook_fault_code to be compiled only for ARM32.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>