Mk/Uses/go.mk: Enable binary package building for Go ports on aarch64

Tentatively enable package building for Go ports on aarch64 to catch
regressions early.

Reviewed by: tobik, Mikaël Urankar <mikael.urankar@gmail.com>
Approved by: tz (mentor, implicit)
Differential Revision: https://reviews.freebsd.org/D22385