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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Simplify interrupt definition: remove mostly unused masks and just
configure everything using interrupt numbers.

Rename all Cavium Octeon device driver functions, structs etc from
"octeon_foo" to "octfoo", except "octeon_eth" becomes "cnmac".

Clean up Cavium Octeon device names. Rename devices from "octeon_foo"
to "octfoo" - this follows the naming conventions used by many other
MIPS CPUs.

Rework cavium support in preparation for MULTIPROCESSOR support

Initial import of Cavium Octeon and Octeon Plus SoC and
specifically Ubiquiti Networks EdgeRouter LITE support.
Currently the ethernet and uart are worked.
This support was contributed by Internet In

Initial import of Cavium Octeon and Octeon Plus SoC and
specifically Ubiquiti Networks EdgeRouter LITE support.
Currently the ethernet and uart are worked.
This support was contributed by Internet Initiative Japan Inc.

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