remove double/tripple o in comments, where it likely was not added on purpose.

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

various aprint_* fixes.

no need for this to use BUS_SPACE_MAP_LINEAR - it uses bus_space properly

Don't forget to initialize sc_dev.

Split device_t and softc for MI mc146818 clock,
and other related misc cosmetics.

Move todr_attach(9) calls from each MD attachment to MI mc146818_attach().

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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avoid bringing in mc146818 routines for kernels that do not have the
'rtc'-style clock linked in. put the rtc code in it's own file and
only link it in if it is actually configured. fixes PR#23342.