Switch to the hermetic toybox gzip. am: 615a1fced5 am: 8f47b62337 am: d3b6ee4295

Original change: https://android-review.googlesource.com/c/platform/system/tools/mkbootimg/+/2631951

Change-Id: I2d4d90c6a99ff50a42631be2443291fab87c7b85
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>