override fstab, removing /mnt/idd

* GPe does not have that partiton formatted as ext4,
  so mounting fails which causes other issues -
  /mnt/shell/emulated isn't created which leads to not
  having the virtual sd fuse-mounted.
* Temporary, will revert when a proper fix has been found
  for the underlying mount/fs_mgr/init issue.

Change-Id: I82ffc85ccd9e08fb6a1241841cffb95ce7b53fc3