Add missing bintime2timespec().

ok art@

typos; from bret lambert

Timecounter based implementation of adjfreq(2). Largely from art@
Tested by various using not (yet) committed amd64 timecounter code.
ok deraadt@

clean up some small fallout from initial freebsd import.

ok grange@

unused variable n; ok cloder

Some cleanup:
- don't mix unsigned and u_int across the code
- un'static some funcs

ok art@

- Match time_second and time_uptime prototypes.
- Less chatty.

This touches only MI code, and adds new time keeping code. The
code is all conditionalized on __HAVE_TIMECOUNTER, and not
enabled on any platforms.

adjtime(2) support exists, courtesy of nordin@, s

This touches only MI code, and adds new time keeping code. The
code is all conditionalized on __HAVE_TIMECOUNTER, and not
enabled on any platforms.

adjtime(2) support exists, courtesy of nordin@, sysctl(2) support
and a concept of quality for each time source attached exists.

High quality time sources exists for PIIX4 ACPI timer as well as
some AMD power management chips. This will have to be redone
once we actually add ACPI support (at that time we need to use
the ACPI interfaces to get at these clocks).

ok art@ ken@ miod@ jmc@ and many more

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