packages: add package ucl for libopencsd-all

This package is installed on arm64 (only) and was missing an entry in
Makefile.package so it was missed in the mechanical conversion run.

This fixes the arm64 package build.

Fixes: f75b20e7ddb8 ("packages: make UCL files required")
Reported by: dch, cperciva
Reviewed by: kevans
Approved by: kevans (mentor)
Differential Revision: https://reviews.freebsd.org/D51374