fs_mgr: remove some dead code

Using logical op on unitialized memory is a bad thing. Good thing
is that this bug is dead because the structure is completely
cleared later via create_verity_device() -> verity_ioctl_init().

Change-Id: Idf5515a888bc6216eda0e23885a789f9b0320bac

fs_mgr/fs_mgr_verity.c

@@ -934,10 +934,6 @@ int fs_mgr_setup_verity(struct fstab_rec *fstab) {
     struct dm_ioctl *io = (struct dm_ioctl *) buffer;
     char *mount_point = basename(fstab->mount_point);
 
-    // set the dm_ioctl flags
-    io->flags |= 1;
-    io->target_count = 1;
-
     // get verity filesystem size
     if (get_fs_size(fstab->fs_type, fstab->blk_device, &device_size) < 0) {
         return retval;