arm64: configs: enable PCIe driver for Armada 7K/8K

This patch enables the driver for the PCIe host controller found on
the Marvell Armada 7K/8K ARM64 SoCs.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>