LinuxKPI: byteorder.h

Add a few more le<n>_{tp,add}_cpu*() #defines/functions found in
wireless drivers. While here fill most of the combinatorics gaps
and also add the remaining combinations [1].

Suggested by: emaste [1] (for one part)
Sponsored by: The FreeBSD Foundation
Reviewed by: hselasky
Differential Revision: https://reviews.freebsd.org/D30418

(cherry picked from commit 5aeeab54b0e1042b09dcea43540994c1ce43eebd)