fix the function pointer and callback mess:
- callback functions return 0 and their result is not checked; make them void.
- there are two types of callbacks and they used to overload their parameters
and the callback structure; separate them into "function" and "value"
callbacks.
- make the wait function signature consistent.

convert the main raidPtr mutex to a kmutex, and add a couple of cv's to
cover the old sleep/wakeup points for adding_hot_spare and waitForReconCond.
convert all remaining simple_lock's to kmutexes (they're not used or compiled
right now... even with all options enabled) and remove the support for them.

this leaves just a pair of tsleep()/wakeup() calls using old scheduling APIs.

convert regionBufferPool.mutex/cond and parityBufferPool.mutex/cond
to kmutex/cv.

convert parityLogPool.mutex to a kmutex.

convert regionInfo[regionID].mutex to a kmutex.

convert reintMutex to a kmutex.

convert parityLogDiskQueue.mutex to a kmutex/cv.

XXX: some splbio() usage to clean up here

convert RF_CommonLogData_s/RF_ReconMap_s mutex to a kmutex/cv.

branches: 1.5.64; 1.5.70;
Kill caddr_t; there will be some MI fallout, but it will be fixed shortly.

branches: 1.4.34; 1.4.72;
Step 2 of the disentanglement. We now look to <dev/raidframe/*> for
the stuff that used to live in rf_types.h, rf_raidframe.h, rf_layout.h,
rf_netbsd.h, rf_raid.h, rf_decluster,h, and a few other places.
Believe it or not, when this is all done, things will be cleaner.

No functional changes to RAIDframe.

branches: 1.3.20; 1.3.22; 1.3.24;
Phase 2 of the RAIDframe cleanup. The source is now closer to KNF
and is much easier to read. No functionality changes.

RAIDframe cleanup, phase 1. Nuke simulator support, user-land driver,
out-dated comments, and other unneeded stuff. This helps prepare
for cleaning up the rest of the code, and adding new functionality.

No functional changes to the kernel code in this commit.

RAIDframe, version 1.1, from the Parallel Data Laboratory at
Carnegie Mellon University. Full RAID implementation, including
levels 0, 1, 4, 5, 6, parity logging, and a few other goodies.
Ported to NetBSD by Greg Oster.