elpa: port to microarch (#13655)
elpa: port to microarch (#13655)

* elpa: port to microarch

* flake8

* Update package.py

* Update var/spack/repos/builtin/packages/elpa/package.py

Co-Authored-By: Adam J. Stewart <023e75a89b1f5ca1e59909f8756c185885836ad9@gmail.com>

LLNL/spack,LLNL/spack,LLNL/spack,LLNL/spack,iulian787/spack,iulian787/spack,iulian787/spack,LLNL/spack,iulian787/spack,iulian787/spack