provide __HAVE_COMPAT_NETBSD32 and fix multiple include protection consistently.

branches: 1.9.12; 1.9.30; 1.9.34; 1.9.38;
On ARM-ish ports having PCI support, use new-style <sys/bus.h>. Do not
install <machine/bus.h>. Remove various <machine/bus.h> sources.

Now that __HAVE_TIMECOUNTER and __HAVE_GENERIC_TODR are invariants,
remove the conditionals and the code associated with the undef case.

branches: 1.7.2; 1.7.8;
Merge the ppcoea-renovation branch to HEAD.

This branch was a major cleanup and rototill of many of the various OEA
cpu based PPC ports that focused on sharing as much code as possible
between the various ports to eliminate near-identical copies of files in
every tree. Additionally there is a new PIC system that unifies the
interface to interrupt code for all different OEA ppc arches. The work
for this branch was done by a variety of people, too long to list here.

TODO:
bebox still needs work to complete the transition to -renovation.
ofppc still needs a bunch of work, which I will be looking at.
ev64260 still needs to be renovated
amigappc was not attempted.

NOTES:
pmppc was removed as an arch, and moved to a evbppc target.

branches: 1.6.6; 1.6.10;
Generic soft interrupts are mandatory.

branches: 1.5.10; 1.5.18;
Enable timecounters for iyonix

Enable __HAVE_GENERIC_TODR. ok gavan@

branches: 1.3.2;
Nothing in the kernel now tests __HAVE_NWSCONS, so stop defining it everywhere.

branches: 1.2.4; 1.2.8;
merge ktrace-lwp.

branches: 1.1.2; 1.1.14;
Initial import of iyonix port.

The Iyonix is a desktop machine from Castle Technology, based on a 600MHz
XScale[tm] 80321 processor.

* Uses the bootloader from NetBSD/acorn32, which is now 32-bit compatible.
* Currently boots multiuser with a serial console.
* Device support is not yet complete.

With help from abs.