big changes to the completion path in ahci.c

- add a ccb_done member to the ahci_ccb, which points to a function that
is used to complete the current xfer
- ccbs no longer rely on an ata_xfer being provided for submission to work
- ahci is stupid and has no way to telling you the difference between an
empty command slot, and a completed command. we keep track of active
commands with ap_active in ahci_port, so we dont try and complete commands
we havent actually submitted
- ahci_start simple submits a command to the hardware now
- provide the start of an interrupt handler for each port (which is not yet
called by the controllers interrupt handler)
- provide an ahci_poll which is built on top of ahci_start and
ahci_port_intr
- remove the fake ata_xfers from the softreset path
- on completion of an ahci command, sync the relevant dma memory
- provide a completion path for ata_xfers which syncs the xfers buffer
and calls the xfers completion handler

in atascsi.c:

- start defining the contents of the response to an ATA IDENTIFY command
specific to SATA
- implement the faking of scsi inquiries, so now you'll actually see a disk
attach to ahci.
- start implementing a fake scsi read capacity. it presents a fake geometry
though, so dont get too excited when ahci magically makes your disk have a
terabyte in size.

lots of discussion, help, tweaks, and an ok from pascoe@

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