Extend installd to support SELinux restorecon function.

Implement new restorecondata function which will allow
the relabeling of /data/data and /data/user directories.
This is needed in the case of certain OTAs. Not every
boot will apply this relabeling however. Consult change
I77bf2a0c4c34b1feef6fdf4d6c3bd92dbf32f4a1 for
clarification on this issue.

Change-Id: I05e8b438950ddb908e46c9168ea6ee601e6d674f
Signed-off-by: rpcraig <rpcraig@tycho.ncsc.mil>
diff --git a/cmds/installd/installd.h b/cmds/installd/installd.h
index b458031..3e9caf3 100644
--- a/cmds/installd/installd.h
+++ b/cmds/installd/installd.h
@@ -213,3 +213,4 @@
 int movefiles();
 int linklib(const char* target, const char* source, int userId);
 int idmap(const char *target_path, const char *overlay_path, uid_t uid);
+int restorecon_data();