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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Switch cobalt to common bus_space.

Tested on raq 2

Convert cobalt to generic mips bus_dma.

Split softc/device_t, with misc related changes.

Add kernel support for optional Z85C30 serial console on Cobalt Qube 2700.
There is some interrupt related issue (in MI z8530tty driver?) on heavy load,
but useful enough for debugging.

Remove obsolete comment.

Use bus_space_map(9) to get bus_space_handle_t on each driver
and remove bogus bus_space_handle_t member from mainbus_attach_args.

- ANSIfy
- KNF
- u_intXX_t -> uintXX_t

merge ktrace-lwp.

s/locdesc_t/int/g

adaptions to config_search() change, and minor autoconf fixes, mostly from Havard Eidnes

Make sure that struct mainbus_attach_args is actually allocated.

With the previous autoconf.c and mainbus.c, the memory in rodata section
which stores "mainbus" strings (for the second arg in config

Make sure that struct mainbus_attach_args is actually allocated.

With the previous autoconf.c and mainbus.c, the memory in rodata section
which stores "mainbus" strings (for the second arg in config_rootfound())
is used to fill mainbus_attach_args in mainbus_search(). Oh well...

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- Use bus_space(9) to access PCI configuration registers on GT64111.
- Remove unused pci stuff from mainbus.c.

TAB/space cleanup.

__KERNEL_RCSID()

Use aprint_normal() for cfprint routines.

Use CFATTACH_DECL().

Declare all cfattach structures const.

Introduce a new routine, config_match(), which invokes the
cfattach->ca_match function in behalf of the caller. Use it
rather than invoking cfattach->ca_match directly.

Some cleanups.

NetBSD/cobalt. Work-in-progress.