Merge branch '2020-06-03-misc-bugfixes'

- Update various docs to not have 'ARCH=' in them as that's not part of
  how U-Boot builds.
- Add macOS tools-only build to Azure to help catch problems on BSD
  hosts with tools.
- Bugfixes from the latest header cleanup around ARCH_DMA_MINALIGN
- Assorted small Kconfig logic/typo corrections
- Add a default hash to FIT images that have their its auto generated.
- Other assorted fixes