Merge branch '2019-03-08-master-imports'

- Assorted minor fixes:
  - ARM: qemu-arm: enable USB boot in distro boot with UEFI
  - image: fdt: handle coalesced reserve region
  - cmd: thordown: Fix spelling of download.
  - fdt: Fix FIT header verification in mkimage and conduct same checks
    as bootm
  - test: Update test-imagetools.sh to match new syntax