restore_year_* not in build_namelist infrastructure

[mnlevy1981]

Description of the issue:

restore_year_first, restore_year_last, and restore_year_align are in the ecosys_forcing_nml namelist, but they are not in the namelist definitions file so users are stuck with the default values.

Version:

• CESM: 2.2
• POP2: master
• Migrating from marbl-ecosys/MARBL#295, originally noted July 2018

Machine/Environment Description:

Machine independent

Any xml/namelist changes or SourceMods:

Problem exists out of the box