Split policy for on-device compilation.

Simulate platform and non-platform split by sending the split files to the
device to be compiled by init.

Bug: 31363362
Test: Policy builds on-device and boots.  sediff shows no difference.
Change-Id: I9627d1c66ca37786d97a049666278a4992ad7579
diff --git a/private/file_contexts b/private/file_contexts
index 83d179d..cdc6d45 100644
--- a/private/file_contexts
+++ b/private/file_contexts
@@ -36,6 +36,9 @@
 
 # SELinux policy files
 /file_contexts\.bin u:object_r:rootfs:s0
+/mapping_sepolicy\.cil   u:object_r:rootfs:s0
+/nonplat_sepolicy\.cil   u:object_r:rootfs:s0
+/plat_sepolicy\.cil      u:object_r:rootfs:s0
 /property_contexts  u:object_r:property_contexts:s0
 /seapp_contexts     u:object_r:rootfs:s0
 /sepolicy           u:object_r:rootfs:s0