Add vold commands for setting up per-user encrypted user
directories

Bug: 19704432

(cherry-picked from commit 75a5202d9f65747edabb1dd0ebd50a779d4142c2)

Change-Id: I733e8745ec21f8e53c2cc6d8a98313275db7d897
diff --git a/Ext4Crypt.h b/Ext4Crypt.h
index 53a26a0..c502b62 100644
--- a/Ext4Crypt.h
+++ b/Ext4Crypt.h
@@ -18,5 +18,7 @@
                       char* value, size_t len);
 int e4crypt_set_field(const char* path, const char* fieldname,
                       const char* value);
+int e4crypt_set_user_crypto_policies(const char *path);
+int e4crypt_create_new_user_dir(const char *user_handle, const char *path);
 
 __END_DECLS