Mark ab/6881855 as merged

Bug: 172690556
Change-Id: I25d60db041007403a0e035e4a0645d1a50b3ef0b
tree: 361aa5a8ebba9026d7d4577210e55b04dfbf173b
  1. hikey/
  2. hikey960/
  3. update-prebuilts.sh