ahci: split ICH and AHCI even more

ahci: split ICH and AHCI even more

Sebastian's patch already did a pretty good job at splitting up ICH-9
AHCI code and the AHCI core. We need some more though. Copyright was missing,
the lspci dump belongs to ICH-9, we don't need the AHCI core to have its
own qdev device duplicate.

So let's split them a bit more in this patch, making things easier to
read an understand.

Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
(cherry picked from commit 7fb6577b130c615e42e1ccf8dad69c27c3eef085)