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

- Add Armada 38x RTC driver (Marek)
- turris_omnia: Misc updates (enable RTC and other cmds) (Marek)
- ds414: Misc updates (enable XHCI_PCI USB support etc) (Phil)
- Convert MVEBU MMC driver to DM (Harm)
- kirkwood: Misc updates and cleanups to some boards (Harm)