Convert cldfrc2m.F90 to CCPP (mostly namelist read), shim for public USEs in CAM, move subroutines to atmos_phys

[jimmielin]

Issue Type

Infrastructure Update

Issue Description

Companion of ESCOMP/atmospheric_physics#374

Within CCPP conversions I believe this is a higher priority to get in because it serves namelist parameters to PUMAS and CAM5 Park macrophysics

Will this change answers?

No

Will you be implementing this yourself?

Yes