Add initial sepolicy for app data snapshots.

Define a rollback_data_file label and apply it to the snapshots
directory. This change contains just enough detail to allow
vold_prepare_subdirs to prepare these directories correctly.

A follow up change will flesh out the access policy on these
directories in more detail.

Test: make, manual
Bug: 112431924

Change-Id: I4fa7187d9558697016af4918df6e34aac1957176
diff --git a/private/file_contexts b/private/file_contexts
index 0605ee4..11f8f6e 100644
--- a/private/file_contexts
+++ b/private/file_contexts
@@ -514,6 +514,10 @@
 # Bootchart data
 /data/bootchart(/.*)?		u:object_r:bootchart_data_file:s0
 
+# App data snapshots (managed by installd).
+/data/misc_de/[0-9]+/rollback(/.*)?       u:object_r:rollback_data_file:s0
+/data/misc_ce/[0-9]+/rollback(/.*)?       u:object_r:rollback_data_file:s0
+
 #############################
 # Expanded data files
 #