hikey-kernel: Update prebuilt kernel to 4.4 (a7dca3d)
am: b129d87

* commit 'b129d872aeaec3085e909f62f439c34d79ed1cf4':
  hikey-kernel: Update prebuilt kernel to 4.4 (a7dca3d)

Change-Id: I2c0bd0176fdfd7bb313ed52c5029a2151e3c62c7