devel/openocd: Unbreak aarch64 build

Working around an issue where upstream provided page size macros are
colliding with page size macros from <machine/param.h>.

PR: 283034
Reported by: Duane (parakleta@darkreality.org)

(cherry picked from commit 7ff81df978340dd7d36c28c38492eb5ec7af6cb9)