[REVIEW] Hide BIT_* macros from userland code

[Stefan Esser]

I have created

        https://reviews.freebsd.org/D33235

to remove the BIT_* macros used in the kernel from the userland API.

They conflict with differing definitions in some 3rd party code and
lead to compile issues in a number of ports (via CPU_* macros based
on the BIT_* macros).

See PR259787 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=259787
for an example of such a problem.

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