Use modules rather than prefixes for several packages

Author: xylar

mache/spack/chicoma-cpu_gnu_mpich.yaml

@@ -106,15 +106,13 @@ spack:
     cray-mpich:
       externals:
       - spec: [email protected]
-        prefix: /opt/cray/pe/mpich/8.1.26/ofi/gnu/9.1
         modules:
         - cray-mpich/8.1.26
       buildable: false
 {% if e3sm_lapack %}
     cray-libsci:
       externals:
       - spec: [email protected]
-        prefix: /opt/cray/pe/libsci/23.05.1.4/GNU/9.1/x86_64
         modules:
         - cray-libsci/23.05.1.4
       buildable: false
@@ -123,7 +121,6 @@ spack:
     hdf5:
       externals:
       - spec: [email protected]~cxx+fortran+hl~java+mpi+shared
-        prefix: /opt/cray/pe/hdf5-parallel/1.12.2.3/GNU/9.1
         modules:
         - cray-hdf5-parallel/1.12.2.3
       buildable: false

mache/spack/chicoma-cpu_nvidia_mpich.yaml

@@ -96,22 +96,21 @@ spack:
     cray-mpich:
       externals:
       - spec: [email protected]
-        prefix: /opt/cray/pe/mpich/8.1.26/ofi/nvidia/20.7
         modules:
         - cray-mpich/8.1.26
       buildable: false
 {% if e3sm_lapack %}
     cray-libsci:
       externals:
       - spec: [email protected]
-        prefix: /opt/cray/pe/libsci/23.05.1.4/NVIDIA/20.7/x86_64
+        modules:
+        - cray-libsci/23.05.1.4
       buildable: false
 {% endif %}
 {% if e3sm_hdf5_netcdf %}
     hdf5:
       externals:
       - spec: [email protected]~cxx+fortran+hl~java+mpi+shared
-        prefix: /opt/cray/pe/hdf5-parallel/1.12.2.3/nvidia/20.7
         modules:
         - cray-hdf5-parallel/1.12.2.3
       buildable: false