sys: Extract __bitcount* from sys/types.h to new sys/bitcount.h

This will allow the code to be reused by the cross-build sys/types.h
wrapper in order to provide the APIs for greater compatibility. This
also provides a path towards eventually removing the definitions from
sys/types.h altogether if so desired by gradually migrating users to
including sys/bitcount.h explicitly, but that is not the primary goal
here.

Note that the copyright header is a direct copu of sys/types.h's given
that's where this code comes from. This could be replaced in future with
a more specific one restricted to just the code in question, depending
on what the copyright for that code is.

Reviewed by:	emaste
Differential Revision:	https://reviews.freebsd.org/D36132

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