config: Generalize infrastructure build materials storage

config: Generalize infrastructure build materials storage

Infrastructure requires lcms and hcms to build.  The build materials
are exposed as infrastructure columns lcms, hcms (struct sctintrins
members in_lcms, in_hcms).  They are per point of efficiency.  In
contrast, sector and unit build materials are defined for 100%.

We want to define build materials for 100% now, for flexibility and
consistency, and we want to optionally support more build materials in
the future.  Replace members in_lcms and in_hcms by array in_mat[],
and provide selectors l_build and h_build.

Additionally provide selectors for all other item types, with value
zero, to help clients prepare for future additional materials.  Use
CA_DUMP_ONLY to keep them out of configuration tables until they
actually work.

Signed-off-by: Markus Armbruster <armbru@pond.sub.org>