Merge "mvebu arm64 for 4.6 (part 2)" from Gregory CLEMENT:

Add initial support for Armada 7K/8K
Update Marvell documentation

* tag 'mvebu-arm64-4.6-2' of git://git.infradead.org/linux-mvebu:
  arm64: update ARCH_MVEBU for Marvell Armada 7K/8K support
  Documentation: arm: add Marvell Armada 7K and 8K families
  Documentation: arm: add link to Armada 38x Functional Spec
  Documentation: arm: improve Armada 37xx description
  Documentation: arm: update Marvell product listing