Remove unnecessary <sys/malloc.h>.

split device_t/softc for all remaining drivers.
replace "struct device *" with "device_t".
use device_xname(), device_unit(), etc.

Use the PROM mapping for the clock, if it exists.
Allows the clock on the Tadpole SPARCle to attach.
Idea from r1.43 of OpenBSD sys/arch/sparc64/sparc64/clock.c

add an XXXSMP comment.

port the openbsd central and fhc drivers, and the clock/zs attachments.
doesn't quite work yet, crashes when central_attach() calls
config_attach() (faulting address is 0xf8000000.)

#include <sys/bus.h> instead of <machine/bus.h>.

Remove unnecessary headers.

Use trunc_page or round_page where appropriate.
No functional changes intended, and generate same binaries.

Don't forget to initialize sc_dev.

Use device_private(), missed in the previous.

Split device_t and softc for MI mk48txx(4) and intersil7170(4) clocks,
and other related misc cosmetics.

- move todr_attach(9) calls from each MD attachment to MI mk48txx_attach()
- don't clear todr_setwen in mk48txx_attach() since it might be set by
MD attachments

More cleanup of sparc64 clock stuff:
- split mkclock attachment from sparc64/clock.c into dev/mkclock.c
(now clock.s only contains clock interrupt and timecounter stuff)
- rename match/attach funct

More cleanup of sparc64 clock stuff:
- split mkclock attachment from sparc64/clock.c into dev/mkclock.c
(now clock.s only contains clock interrupt and timecounter stuff)
- rename match/attach functions of rtc at ebus to match the device name
- update some comments around clock devices in GENERIC

No objection on port-sparc64 for a month.

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