Remove APEX sepolicy support am: e9448817b3 am: befd9372d7 am: 298608b246

Original change: https://android-review.googlesource.com/c/platform/external/selinux/+/2736178

Change-Id: I372c214844771151969d8b021023b6e7a6fe1862
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>