partition: add support dm_use_original_path

    * On some mediatek devices we must use symlinked path instead of the
      real block device.  Needed for decryption on some MTK HW FDE devices.

Change-Id: Ib48d745fd442c590aea2baf6d2dbe20aaaef9eec
diff --git a/partitions.hpp b/partitions.hpp
index 49ebf60..ef70f37 100755
--- a/partitions.hpp
+++ b/partitions.hpp
@@ -279,6 +279,9 @@
 	TWExclude backup_exclusions;                                              // Exclusions for file based backups
 	TWExclude wipe_exclusions;                                                // Exclusions for file based wipes (data/media devices only)
 	string Key_Directory;                                                     // Metadata key directory needed for mounting FBE encrypted data partitions using metadata encryption
+	string Original_Path;
+	bool Use_Original_Path;
 	struct partition_fs_flags_struct {                                        // This struct is used to store mount flags and options for different file systems for the same partition
 		string File_System;
 		int Mount_Flags;