wav2ocn and ocn2wav maps are still needed in some cases

[jedwards4b]

Description of changes

Reintroduce wav2ocn and ocn2wav map xml variables.

Specific notes

Contributors other than yourself, if any: mvertens

CMEPS Issues Fixed (include github issue #):

Are changes expected to change answers? (specify if bfb, different at roundoff, more substantial)

Any User Interface Changes (namelist or namelist defaults changes)?

Testing performed

Please describe the tests along with the target model and machine(s) If possible, please also added hashes that were used in the testing