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timecounting: deprecate time_second(9), time_uptime(9)

time_second(9) has been replaced in the kernel by gettime(9).
time_uptime(9) has been replaced in the kernel by getuptime(9).

New code should use the replacement interfaces.  They do not suffer
from the split-read problem inherent to the time_* variables on 32-bit
platforms.

The variables remain in sys/kern/kern_tc.c for use via kvm(3) when
examining kernel core dumps.

This commit completes the deprecation process:

- Remove the extern'd definitions for time_second and time_uptime
  from sys/time.h.
- Replace manpage cross-references to time_second(9)/time_uptime(9)
  with references to microtime(9) or a related interface.
- Move the time_second.9 manpage to the attic.

With input from dlg@, kettenis@, visa@, and tedu@.

ok kettenis@

.\"	$OpenBSD: hardclock.9,v 1.13 2020/06/26 18:48:31 cheloha Exp $
.\"
.\" Copyright (c) 2001 Kenneth R Westerback
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.Dd $Mdocdate: June 26 2020 $
.Dt HARDCLOCK 9
.Os
.Sh NAME
.Nm hardclock
.Nd real-time system clock
.Sh SYNOPSIS
.In sys/systm.h
.Ft void
.Fo hardclock
.Fa "struct clockframe *frame"
.Fc
.Sh DESCRIPTION
.Fn hardclock
implements the real-time system clock, interrupting
.Xr hz 9
times a second.
The argument
.Fa frame
is an opaque, machine dependent structure that encapsulates the
previous machine state.
.Pp
.Fn hardclock
performs a variety of time related housekeeping tasks, such as:
.Bl -bullet -offset indent
.It
If the current process has virtual or profiling interval
timers, update the timers and deliver appropriate signals.
.It
If there is no separate statistics clock, execute
.Fn statclock .
.It
Increment the time of day, implementing any adjustments requested by
.Xr adjtime 2
or required as a result of running an NTP daemon or other configured
external clock.
.It
Update the real-time timeout queue, calling
.Fn softclock
directly if the current interrupt priority is low enough.
.El
.Sh CODE REFERENCES
.Fn hardclock
is implemented in the file
.Pa sys/kern/kern_clock.c .
.Sh SEE ALSO
.Xr adjtime 2 ,
.Xr hz 9 ,
.Xr microtime 9 ,
.Xr spl 9 ,
.Xr timeout 9