libefivar: Apply uncrustify changes

Apply uncrustify changes to .c/.h files.

Reduce the diffs with EDK2 to aid with future merges. The
unconventional way we've imported this code makes using a vendor branch
to manage it at the very least tricky. Update FreeBSD-update to reflect
the slight shift in advise.

Reviewed by: imp
Upstream Bug: https://bugzilla.tianocore.org/show_bug.cgi?id=3737
Obtained from: https://github.com/tianocore/edk2/commit/2f88bd3a1296c522317f1c21377876de63de5be7
Pull Request: https://github.com/freebsd/freebsd-src/pull/581