arm64: mvebu: Armada 7K/8K: Add Armada 7K/8K dts files

arm64: mvebu: Armada 7K/8K: Add Armada 7K/8K dts files

This patch integrates the Armada 7K/8K dts files from the latest
submission on the linux-arm-kernel mailing list.

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>