time conversion in delay().
fd.c: Minor changes to autoconfig. Use dv_parent rather than storing another
pointer to the fdc_softc in each fd_softc. Change disk label stuff for our
kernel.
icu.s: Make splx() and splnone() return previous cpl for now.
isa.c: Minor autoconfig changes.
isa.h: rtcin() is now nvram() and is declare in nvram.h. Make isaphysmem a
caddr_t.
pccons.c: XXXX: Maybe we should insist they open /dev/io now.
timerreg.h: #define TIMER_NPORTS.
wd.c: Delete unused wdnoreloc() and wddospart(), and use remaining two bits in
unit number. struct disk --> struct wd_softc. struct board --> struct
wdc_softc. Still needs much work.
