hikey-kernel: Update prebuilt kernel to 4.4.8 (956a9dd)
am: 78e2e21bb4

* commit '78e2e21bb4a9857a2be5b7021fef7f3c4c0baa99':
  hikey-kernel: Update prebuilt kernel to 4.4.8 (956a9dd)

Change-Id: I6ead207ebfbf856b5dbcbb7790447a692cd9ab65