hikey: flash-all.sh: Update flash-all script to use boot.img, since its the new default am: a58bd3fcc0
am: 27c85a17f9

* commit '27c85a17f9650e6f9838167bbc6db2d75908b540':
  hikey: flash-all.sh: Update flash-all script to use boot.img, since its the new default

Change-Id: I7b319fa0ecc1762c772993a4c6708d3d6b08d34d