hikey960: Fixup the hisi-bootloader flashall script am: dea899234d am: 519225db35 am: a7dd4a6b87 am: 82356ec567

Original change: https://android-review.googlesource.com/c/device/linaro/hikey/+/1646411

Change-Id: I8c96ef125ee52f3d419a20ba2274e21087f1c87d