Bug 25201

The beep duration of pccard event and syscons is changed
on the kernel compiled with ``options HZ=1000'' option.

Checking code using sysbeep, I found hz depend coding in
sys/pccard/pccard_beep.c, sys/i386/isa/pcvt/pcvt_kbd.c,
sys/dev/syscons/syscons.h, sys/pc98/pc98/sc_machdep.h.

These four codes have hard coded duration of sysbeep function,
but the unit of sysbeep's duration argument is 1/hz second.
Thus, the duration scaling of hz is needed.

Furthermore, sc_bell's duration is loaded from escape sequence
in sys/dev/syscons/scterm-sc.c, sys/pc98/pc98/scterm-sck.c.
From kbdcontrol manual and usr.sbin/kbdcontrol/kbdcontrol.c coding,
the unit of duration value in escape sequence is 10msec.
Thus hz scaling is needed in the case hz != 100.

The codes calling timeout with hard coded ticks would cause the same problem.

Fix: o sys/pccard/pccard_beep.c
  Add hz scaling code to pccard_beep_sub and pccard_beep_start.

o sys/i386/isa/pcvt/pcvt_kbd.c
  Add hz scaling to PLING and PLONG macros.

o sys/dev/syscons/syscons.h, sys/pc98/pc98/sc_machdep.h
  Add hz scaling to BELL_DURATION macro.

o sys/dev/syscons/scterm-sc.c, sys/pc98/pc98/scterm-sck.c
  Add hz scaling code to ``set bell pitch and duration'' escape sequence.

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How-To-Repeat: Add ``options HZ=1000'' and install new kernel.
Hear pccard beep/syscons beep.