update ncpl and cpl_seq_option for mom6
Updates ATM_NCPL, OCN_NCPL, ROF_NCPL, and CPL_SEQ_OPTION for MOM6.

Test suite: aux_mom
Test baseline: /glade/scratch/altuntas/cesm.tests/cheyenne/aux_mom/190808
Test namelist changes: no changes (except mom6 cases)
Test status: : bit for bit (except mom6 cases)

User interface changes?: N

Update gh-pages html (Y/N)?: N

Code review: