Merge "hikey960: add link for mainline kernel build instructions" am: 983cd2a208 am: 59d29b436d am: 6da379846e am: 3be55c766f am: c721aa41b3

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

Change-Id: I36d9e4d0dc07f104223cf5bc7fdeeba4f770aaab
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>