Those symbols were removed in kernel 4.16:
commit
4670d610d59233b017a6ea1fa25bbf06dabbff42
Author: Rob Herring <robh@kernel.org>
PCI: Move OF-related PCI functions into PCI core
Fixes: FS#2588
Signed-off-by: Petr Štetiar <ynezz@true.cz>
CONFIG_NVMEM=y
CONFIG_OF=y
CONFIG_OF_ADDRESS=y
-CONFIG_OF_ADDRESS_PCI=y
CONFIG_OF_EARLY_FLATTREE=y
CONFIG_OF_FLATTREE=y
CONFIG_OF_GPIO=y
CONFIG_OF_KOBJ=y
CONFIG_OF_MDIO=y
CONFIG_OF_NET=y
-CONFIG_OF_PCI=y
-CONFIG_OF_PCI_IRQ=y
CONFIG_PCI=y
CONFIG_PCI_AR71XX=y
CONFIG_PCI_AR724X=y