Fixes a link error on layerscape platform, linking fails with CONFIG_PCI set and CONFIG_PCI_LAYERSCAPE unset. Signed-off-by: Alex Marginean <alexm.osslist@gmail.com> Reviewed-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Prabhakar Kushwaha <prabhakar.kushwaha@nxp.com>