Add a mount with metadata encryption service

Don't use the FDE flow to support metadata encryption; just provide a
vold service which directly mounts the volume and use that.

Bug: 63927601
Test: Boot Taimen to SUW with and without metadata encryption.
Change-Id: Ifc6a012c02c0ea66893020ed1d0da4cba6914aed
diff --git a/cryptfs.cpp b/cryptfs.cpp
index aa60541..e363835 100644
--- a/cryptfs.cpp
+++ b/cryptfs.cpp
@@ -1974,7 +1974,7 @@
     tot_encryption_size = crypt_ftr->fs_size;
 
     rc = cryptfs_enable_inplace(crypto_blkdev, real_blkdev, crypt_ftr->fs_size, &cur_encryption_done,
-                                tot_encryption_size, previously_encrypted_upto);
+                                tot_encryption_size, previously_encrypted_upto, true);
 
     if (rc == ENABLE_INPLACE_ERR_DEV) {
         /* Hack for b/17898962 */