hikey960: set default kernel to 5.10 am: 7788ffd9eb am: a356ea0c83 am: e688182ea8

Original change: https://android-review.googlesource.com/c/device/linaro/hikey/+/2469591

Change-Id: I06c38aaff55b677bbdac854559a4eab46fc70566
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>