cleanup header and machine dependency.

cleanup header and machine dependency.

SCCS-vsn: sys/news3400/iodev/psd.c 7.3
SCCS-vsn: sys/news3400/iodev/scsi.c 7.3
SCCS-vsn: sys/news3400/iodev/scsireg.h 7.3
SCCS-vsn: sys/news3400/iodev/sd.c 7.5
SCCS-vsn: sys/news3400/iodev/sd_var.c 7.3
SCCS-vsn: sys/news3400/iodev/sdreg.h 7.3
SCCS-vsn: sys/news3400/iop/fb.c 7.3
SCCS-vsn: sys/news3400/iop/fb_sub.c 7.3
SCCS-vsn: sys/news3400/iop/fbreg.h 7.3
SCCS-vsn: sys/news3400/iop/iop.c 7.3
SCCS-vsn: sys/news3400/iop/kb.c 7.3
SCCS-vsn: sys/news3400/iop/kbreg.h 7.3
SCCS-vsn: sys/news3400/iop/rs.c 7.4
SCCS-vsn: sys/news3400/news3400/clock.c 7.7
SCCS-vsn: sys/news3400/news3400/genassym.c 7.5
SCCS-vsn: sys/news3400/news3400/kbms_if.c 7.3