Merge "hikey960: add link for mainline kernel build instructions" am: 983cd2a208 am: 59d29b436d am: 6da379846e

Original change: https://android-review.googlesource.com/c/device/linaro/hikey/+/2487455

Change-Id: I658147971fa482b7af504eb19b62fb5ce4ce581e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>