Revert "Upgrade zerocopy to 0.7.5" am: 918dbbab86 am: da1810f90d

Original change: https://android-review.googlesource.com/c/platform/system/tools/mkbootimg/+/2787439

Change-Id: Ib10371e26ff7b5deaaff6d3b9c0facbaae836aaa
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>