hikey-kernel: Update kernel prebuilt to Image-dtb (6d9a0bc) am: 6c65550bed
am: d0deaf7195

* commit 'd0deaf7195f5a1ad7da2c7fbf3392dfa0be74a7b':
  hikey-kernel: Update kernel prebuilt to Image-dtb (6d9a0bc)

Change-Id: I9fdfd29f42793d4d2964a92ef69b9b49b5f45a53