pci: mvebu: Add PCIe driver for Armada-8K

pci: mvebu: Add PCIe driver for Armada-8K

This patch adds a driver for the PCIe controller integrated in the
Marvell Armada-8K SoC. This controller is based on the DesignWare
IP core.

The original version was written by Shadi and Yehuda. I ported this
driver to the latest mainline U-Boot version with DM support.

Tested on the Marvell DB-88F8040 Armada-8K eval board.

Signed-off-by: Shadi Ammouri <[email protected]>
Signed-off-by: Yehuda Yitschak <[email protected]>
Signed-off-by: Stefan Roese <[email protected]>
Reviewed-by: Simon Glass <[email protected]>
Cc: Nadav Haklai <[email protected]>
Cc: Neta Zur Hershkovits <[email protected]>
Cc: Kostya Porotchkin <[email protected]>
Cc: Omri Itach <[email protected]>
Cc: Igal Liberman <[email protected]>
Cc: Haim Boot <[email protected]>
Cc: Hanna Hawa <[email protected]>