hikey-kernel: Update prebuilt kernel to 4.4 (a7dca3d) am: 698ab23
am: 04ec193

* commit '04ec1931b1e993b14632c22f3b16e4ffe83800e1':
  hikey-kernel: Update prebuilt kernel to 4.4 (a7dca3d)

Change-Id: Ie81d37d83fda51fd8f89924db0f2769e09819840