pci_alloc_consistent is under 4G by default.  Also simplify the
definition of bus_dmamap_t.
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

There's not much sense in sharing code anymore now that aic7xxx uses
various transport class facilities.
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!