hikey: README: Update documentation to use boot.img instead of boot_fat.uefi.img
am: c5ec19591f

* commit 'c5ec19591f84a2cbc519a328995794f1af680c09':
  hikey: README: Update documentation to use boot.img instead of boot_fat.uefi.img

Change-Id: Ic6bc504c116b1bab0f2da95417595bdfe2da75c8