Merge branch 'brhillman/atm/add-ena-rrm' (PR #1269)

Add configuration for a new regionally-refined (ne30 to ne120) grid over the Eastern North Atlantic.
All components run on the RRM grid (enax4v1). All needed input files to run the new configuration
have been uploaded to the input data repository. Supported compsets include only FC5AV1C-04P2
(72 levels), but RTM needs to be turned off (xmlchange RTM_MODE=NULL).

Fixes #1357

* brhillman/atm/add-ena-rrm:
  Set ATM_NCPL for ENA grid
  Set CAM_DYCORE to se for RRM grids
  Set CLM namelist definitions and defaults for ENA
  Set CAM namelist defaults for ENA grid
  Add ENA grid size to CAM configuration
  Add cime configuration for ENA grid

cime_config/config_component_acme.xml

@@ -279,6 +279,7 @@
       <value compset=".+" grid="a%ne0np4_conus_x4v1" >96</value>
       <value compset=".+" grid="a%ne0np4_svalbard_x8v1" >144</value>
       <value compset=".+" grid="a%ne0np4_sooberingoa_x4x8v1" >144</value>
+      <value compset=".+" grid="a%ne0np4_enax4v1" >96</value>
       <value compset=".+" grid="a%T42">72</value>
       <value compset=".+" grid="a%T85">144</value>
       <value compset=".+" grid="a%T341">288</value>