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?).

show more ...

Add support for dynamic flash partitions

Add support for decoding legacy Toshiba TC58NVG2S0H NAND chip params.

Use ONFI_STATUS_WP instead of 0x80.

Wait STATUS_RDY after ONFI_RESET.

remove unused

Endiannes fixes from Brett Slager in ONFI Param page parsing.
Similar changes in nandemulator by me.
Remove panic about more than one LUNs.

Make nc_block_pages go aways, its redundant and unused.
Print more info on attach including the width.

Use %zu formats to print size_t values.

No longer use size_t in the chip structure.

Hook nand_samsung.c into the build, and use it if a legacy chip
from Samsung is found.

Deal with a spare size of 32. XXX necc_offset is only a guess.

Rename isbad argument to is_bad - stupid namespace pollution and ancient
bad sector routines interfere on some archs and cause global shadowing
warnings.

Add support for CFI NOR, using MPC8536DS as initial example.
Only AMD/Fujitsu command set is suported so far.
This is still work in progress, be advised.

Make this actually compile by adding a wrapper function which calls
flash_io_submit.

Refactor flash and nand driver, so we can reuse the io thread code
in the future nor driver (and any other future driver).

Also simplify some of the code in the process, eg. saner flash attachment.

follow bus_space conventions in naming

Remove trailing tabs, add RCS IDs.

it seems we have a config_detach_children (though undocumented)
lets use that to detach flash devices before detaching nand

fix some bugs in detachment

Fix locking and simplify some error path.

Fix badblock checking
Replace flash_addr_t with flash_off_t and use it to address flash everywhere

Add support for redifining page read and program functions by drivers.
Some controllers implement read/write in one step, so this is required
to support those.

Add some PRIxxx macros to correctly print stdint types