MFC r315067: Partially fix target task management requests handling.

- XPT_NOTIFY_ACKNOWLEDGE was not handled, causing stuck requests.
- XPT_ABORT was not even trying to abort active ATIOs/INOTs.
- Initiator's tag was not stored and not used where needed.
- List of TM request types needed update.
- mpt_scsi_tgt_status() missed some useful debugging.

After this change global TM requests, such as reset, should work properly.
ABORT TASK (ABTS) requests are still not passes to CTL, that is not good
and should be fixed.

MFC r315002: Improve residuals reporting in target mode.

MFC r314998: Fix FC target mode in mpt(4), broken in multiple ways.

- Not set BufferLength caused receive of empty ATIOs.
- CDB length guessing was broken at least for RC16.
- mpt_req_untimeout() was called with wrong req parameter.
- Sense data reporting was broken in several ways.

With this change my LSI7204EP-LC can pass at least basic tests as target.
The code is still far from perfect, but finally I found second hw/driver
after isp(4) that really can work in CAM target mode.

MFC r314967: Add support for XPT_GET_SIM_KNOB in FC mode.

MFC r314968: Report some more data in XPT_PATH_INQ.

I am not sure they are used anywhere, but why not.

MFC: r285840

- In mpt_send_handshake_cmd(), use bus_space_write_stream_4(9) for writing
raw data to the doorbell offset in order to clarify the intent and for
avoiding unnecessarily converting the endianess back and forth.
Unfortunately, the same can't be done in mpt_recv_handshake_reply() as
16-bit data needs to be read using 32-bit bus accessors.
- In mpt_recv_handshake_reply(), get rid of a redundant variable.

MFC r274819:
Prevent overflow issues in timeout processing

MFC r274852:
Fix build with asr driver

Sponsored by: Multiplay

MFC: r260058

- Remove a redundant variable in mpt_pci_attach().
- #if 0 the currently unused paired port linking and unlinking of dual
adapters.
- Simplify MSI/MSI-X allocation and release. For a single one, we don't need
to fiddle with the MSI/MSI-X count and pci_release_msi(9) is smart enough
to just do nothing in case of INTx.
- Canonicalize actions taken on attach failure and detach.
- Remove the remainder of incomplete support for older FreeBSD versions.

MFC r274819:
Prevent overflow issues in timeout processing

MFC r274852:
Fix build with asr driver

Sponsored by: Multiplay

MFC: r260058

- Remove a redundant variable in mpt_pci_attach().
- #if 0 the currently unused paired port linking and unlinking of dual
adapters.
- Simplify MSI/MSI-X allocation and release. For a single one, we don't need
to fiddle with the MSI/MSI-X count and pci_release_msi(9) is smart enough
to just do nothing in case of INTx.
- Canonicalize actions taken on attach failure and detach.
- Remove the remainder of incomplete support for older FreeBSD versions.