This adds a PCI driver for the controllers found on Marvell MVEBU SoCs.
Besides the functional driver itself, it also adds SoC specific PHY
setup required for PCIe. Currently, only Armada 370 is fully supported.

Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Acked-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>