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

- a37xx: pci: Increase PCIe IO size from 64 KiB to 1 MiB (Pali)
- phy: marvell: a3700: Misc improvements (Pali)
- a38x serdes cleanup (Pali)
- A3720 PCIe enhancements (Pali & Marek)
- mvebu: mvebu_armada-8k: Puzzle M801 enhancements (Robert)
- mvebu: x530: Remove custom kwbimage.cfg (Chris)
- mvebu: Select SPL_SKIP_LOWLEVEL_INIT on ARMADA_32BIT (Stefan)