Add metadata decrypt support for FBE

Change-Id: Ie0292f4ffea5993a4ae74fa04fc5c8252ca2cfcf

BasePartition.cpp

@@ -0,0 +1,28 @@
+/*
+	Copyright 2018 TeamWin
+	This file is part of TWRP/TeamWin Recovery Project.
+
+	TWRP is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	TWRP is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with TWRP.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+
+#include "partitions.hpp"
+
+// On devices that need it, this is supposed to be overridden using
+// TARGET_RECOVERY_TWRP_LIB to allow device-specific pre and post
+// wipe encryption calls.
+
+BasePartition* make_partition() {
+  return new BasePartition();
+}