hikey-kernel: Add hikey960 android-5.4 kernel and modules am: 116a79898b am: 12b794bfdc

Original change: https://android-review.googlesource.com/c/device/linaro/hikey-kernel/+/1324301

Change-Id: I670b163eede4bb60c197e2ded9491d45ad4b6541
tree: 193f73823093cf964ab60462202b56e226e0357f
  1. hikey/
  2. hikey960/
  3. update-prebuilts.sh