init: remove unfinished fsverity signature support for APEX sepolicy am: 0b2c5cde1f

Original change: https://android-review.googlesource.com/c/platform/system/core/+/2647684

Change-Id: If2a1b17f033a7d53617db9826db8a51664241cb1
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>