arm64: mvebu: Add PCI support to DB-88F8040 board

arm64: mvebu: Add PCI support to DB-88F8040 board

This patch adds PCI support to the Marvell Armada-8K devel board.
Additionally the Intel E1000 ethernet driver is enabled so that
network support is available on this board, even without the
internal network interfaces being supported (yet).

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Nadav Haklai <nadavh@marvell.com>
Cc: Neta Zur Hershkovits <neta@marvell.com>
Cc: Kostya Porotchkin <kostap@marvell.com>
Cc: Omri Itach <omrii@marvell.com>
Cc: Igal Liberman <igall@marvell.com>
Cc: Haim Boot <hayim@marvell.com>
Cc: Hanna Hawa <hannah@marvell.com>