Revert "mdadm: 3.3 -> 3.3.2".

This reverts commit 7719f7f2, again!

It prevents systems from booting, for two reasons:

  * The initrd size is going to explode, but I think this is not the
    REAL issue. We had that in 666cf992

 already, which reverted this
    update already.
  * Another reason I don't yet know, which is the REAL issue. We need to
    investigate and fix that before attempting another update.

Because of that I've also added a small comment before the src attribute
to prevent further updates like this.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>