Merge nick-nhusb

- API / infrastructure changes to support memory management changes.
- Memory management improvements and bug fixes.
- HCDs should now be MP safe
- conversion to KERNHIST based debug
- FS/LS isoc support on ehci(4).
- conversion to kmem(9)
- Some USB 3 support - mostly from Takahiro HAYASHI (t-hash).
- interrupt transfers now get proper DMA operations
- general bug fixes
- kern/48308
- uhub status notification improvements
- umass(4) probe fix (applied to HEAD already)
- ohci(4) short transfer fix

Put the kernelside rump kernel headers into <rump-sys> instead of
sprinkling them around the faction directories. Avoids having
to add a CPPFLAGS (or several) to pretty much every component
Makefile.

Leave compat headers around in the old locations.

The commit changes some autogenerated files, but I'll fix the
generators shortly and regen.

Use IOCONF #define to determine component name.

Avoids having to manually retype info already in .ioconf.

Also, COMPONENT_SIMPLE -> RUMP_COMPONENT=simple. That way, we can add
other attributes where necessary. As "future directions", the "ioconf"
attribute for RUMP_COMPONENT can just be removed when a driver is
converted to modular and has a proper modcmd.

Make it easier to create rump kernel components, part 1.

Reduce copypasteware for the component constructors. If a constructor
calls only config_init_component(), handle it from a common source file
instead of copying the same(ish) file around to every component.

Add a COMMENT describing what each component roughly does.

"make describe" prints the comment.

Requested/inspired by Vincent Schwarzer on rumpkernel-users

Fully build ugenhc only on archs where libusb is built.

branches: 1.8.6;
rename rumpcomp_user.* -> ugenhc_user.*

Move the bus_dma implementation that works only with ugenhc into the
ugenhc component itself.

branches: 1.6.4;
problem with ioconf.c solved, reenable

duh, the untypoed version doesn't work with bsd.ioconf.mk. comment it
out while i figure it out

typo

The ioctl hypercall is used only by the usb host controller driver,
so make it exclusive to that component. I'm happy to see it gone.

branches: 1.2.2; 1.2.6; 1.2.14; 1.2.24;
Use config pseudo-root keyword instead of monolithic configurations
starting from root.

Move a bunch of rump components from dev/wip to dev/lib now that
they've reached a certain maturity.