sepolicy: add support for devices without cache partition

Adds the rules for /data/cache used for devices which do
not have a cache partition.

Bug: 28747374
Change-Id: I7c749e7692c9b8eab02029bbae5a3c78585030da

file_contexts

@@ -355,6 +355,13 @@
 # LocalTransport (backup) uses this subtree
 /cache/backup(/.*)?		u:object_r:cache_private_backup_file:s0
 
+/data/cache(/.*)?		u:object_r:cache_file:s0
+/data/cache/recovery(/.*)?	u:object_r:cache_recovery_file:s0
+# General backup/restore interchange with apps
+/data/cache/backup_stage(/.*)?	u:object_r:cache_backup_file:s0
+# LocalTransport (backup) uses this subtree
+/data/cache/backup(/.*)?	u:object_r:cache_private_backup_file:s0
+
 #############################
 # sysfs files
 #