Merge thorpej-cfargs2.

Merge thorpej-cfargs branch:

Simplify and make extensible the config_search() / config_found() /
config_attach() interfaces: rather than having different variants for
which arguments you want pass a

Merge thorpej-cfargs branch:

Simplify and make extensible the config_search() / config_found() /
config_attach() interfaces: rather than having different variants for
which arguments you want pass along, just have a single call that
takes a variadic list of tag-value arguments.

Adjust all call sites:
- Simplify wherever possible; don't pass along arguments that aren't
actually needed.
- Don't be explicit about what interface attribute is attaching if
the device only has one. (More simplification.)
- Add a config_probe() function to be used in indirect configuiration
situations, making is visibly easier to see when indirect config is
in play, and allowing for future change in semantics. (As of now,
this is just a wrapper around config_match(), but that is an
implementation detail.)

Remove unnecessary or redundant interface attributes where they're not
needed.

There are currently 5 "cfargs" defined:
- CFARG_SUBMATCH (submatch function for direct config)
- CFARG_SEARCH (search function for indirect config)
- CFARG_IATTR (interface attribte)
- CFARG_LOCATORS (locators array)
- CFARG_DEVHANDLE (devhandle_t - wraps OFW, ACPI, etc. handles)

...and a sentinel value CFARG_EOL.

Add some extra sanity checking to ensure that interface attributes
aren't ambiguous.

Use CFARG_DEVHANDLE in MI FDT, OFW, and ACPI code, and macppc and shark
ports to associate those device handles with device_t instance. This
will trickle trough to more places over time (need back-end for pre-OFW
Sun OBP; any others?).

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split device_t/softc for all remaining drivers.
replace "struct device *" with "device_t".
use device_xname(), device_unit(), etc.

Change old-style function defintions to C89 prototypes.

Approved by releng.

Tons of enchancements to MD PCI code:
- The G-REX 4000 and G-REX 1200 are now really supported and working (still only 1st slot but the rest are a matter of time).
- Add bridge identification to p5pb

Tons of enchancements to MD PCI code:
- The G-REX 4000 and G-REX 1200 are now really supported and working (still only 1st slot but the rest are a matter of time).
- Add bridge identification to p5pb, simplifies the driver and make it more user-friendly.
- Retire P5PB_GENFB and P5PB_OLD_FIRMWARE options, these are now handled automatically, depending on used hardware and firmware.
- Add PCI bus reconfiguration support to p5pb (PCI_NETBSD_CONFIGURE), allows using G-REX without boot to AmigaOS.
- Bring p5pb registers desription up to date with my knowledge.
- Add a lot of debugging code to p5pb (enabled by P5PB_DEBUG kernel option).
- Fix PCI_NETBSD_CONFIGURE in mppb (now it really works).
- Fix quirk handling in zbus.
- Update GENERIC.in and regen the kernel configs.
- Misc cleanup.

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Changes to Phase5 hardware support:
- Rework p5pb driver - simplify, cleanup, make more flexible.
- Add p5membar driver, which handles PCI resources autoconfigured by the firmware.
- Introduce interm

Changes to Phase5 hardware support:
- Rework p5pb driver - simplify, cleanup, make more flexible.
- Add p5membar driver, which handles PCI resources autoconfigured by the firmware.
- Introduce intermediate p5bus layer, between zbus and CSPPC/BPPC on-board devices (p5pb, cbiiisc, bppcsc).
- Add experimental G-REX support to p5pb (first slot support only).
- Split CV64/3D PCI bridge support into separate cv3dpb driver (to be committed later).

Approved by phx.

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