Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Add pccard_device.c

Move to generating pccarddevs.h on the fly, both for the kernel and
the modules.

Also generate usbdevs.h automatically now, but a non-kernel file is
stopping that at the moment.

I don't think that these modules should export symbols at all. All
intermodule communication is done via kobj calls. If anything
currently depends on them, let it break so that we can fix it. Maybe
we'll need to export some of the card_if.c or power_if.c symbols, but
I think those should be in the base kernel (since all *_if.c should be
in the base kernel for just these reasons).

Drop <bsd.man.mk> support from <bsd.kmod.mk>.

Not objected to by: -current

Turn on unconditional symbol export for modules whose API is
not clear enough, will require additional analysis, or will
require some input from their maintainers.

Use a consistent style and one much closer to the rest of /usr/src

Resplit pcic back into two pcic and pccard.

Use .include <bsd.kmod.mk> to get to ../../*/conf/kmod.mk instead of
encoding the relative path.

Pull in sys/conf/kmod.mk, rather than /usr/share/mk/bsd.kmod.mk.
This means that the kernel can be totally self contained now and is not
dependent on the last buildworld to update /usr/share/mk. This might
also make it easier to build 5.x kernels on 4.0 boxes etc, assuming
gensetdefs and config(8) are updated.

Add resource activation routines to pcic driver. Minor cleanup of
socket attach code. We now have at least a chance for pccard devices
appearing in the future.

This is a snapshot of ongoing work. Proceed at your own risk.

Removed special rules for building and cleaning device interface files
and empty options files. The rules are now generated automatically in
bsd.kmod.mk. Cleaned up related things ($S and ${CLEANFILES}).

Newcard's pccard module. It compiles, but doesn't work. This should
make development easier and push the ability of newbus to load busses
to the test.

Not added to sys/modules/Makefile because it isn't ready to break the
nightly snapshots for alpha yet :-).

NOTE: This is only for NEWCARD. The old pccard stuff will not build
as a loadable module.