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

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

Change-Id: I8dec77b68d17998904b36d3ecc6a3b83af90b92b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>