Merge branch 'next' of https://source.denx.de/u-boot/custodians/u-boot-marvell into next

- mvebu: kwboot: Fix UART booting (Pali)
- mvebu: doc: Misc updates / fixes (Pali)
- kirkwood: Early init enhancements, e.g. for DEBUG UART (Pali & Tony)
- mvebu: Enable NAND flash for Thecus N2350 board (Tony)
- mvebu: Set common SPI flash default speed and mode (Tony)