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

- Add base support for Marvell OcteonTX2 CN9130 DB (mostly done
  by Kostya)
- Sync Armada 8k MMU setup with Marvell version (misc Marvell
  authors)
- spi: kirkwood: Some fixes especially for baudrate generation
  (misc Marvell authors)
- mvebu: x530: Reduce SPL image size (Stefan)
- Rename "rx_training" to "mvebu_comphy_rx_training" (Stefan)