How to add SELinux policy on a user-debug ROM that has `split` policy scheme?
To patch the policies, do the following:


Change the value in /system/etc/selinux/plat_and_mapping_sepolicy.cil.sha256 OR empty this file.
Inject required policies in /system/etc/selinux/plat_sepolicy.cil
"Loading compiled SELinux policy" should show in logs and the init service will run fine.