Merge https://gitlab.denx.de/u-boot/custodians/u-boot-marvell

- Various improvements to Keymile boards - mostly DT conversation
  (Pascal & Holger)
- Removal of now unsupported Keymile boards (Pascal & Holger)
- Small MVEBU PCI fix (Marek)
- Turris Omnia defconfig update (Marek)
- Misc Allied Telesis defconfig updates (Chris)