sepolicy: Allow recovery to set system properties

 * This is used by extremely critical things.

Change-Id: Ie529851469408adac1e081fe4f6dc5daa9002933
diff --git a/sepolicy/recovery.te b/sepolicy/recovery.te
index cf230f7..870c5f8 100644
--- a/sepolicy/recovery.te
+++ b/sepolicy/recovery.te
@@ -39,4 +39,6 @@
 allow recovery recovery_cache_file:dir create_dir_perms;
 allow recovery recovery_cache_file:file create_file_perms;
 
+# set system properties for various things
+allow recovery system_prop:property_service set;
 ')