ne3np4 to namelist_defaults_ctsm.xml and Makefile

[slevis-lmwg]

Description of changes

Same as title.

Specific notes

Contributors other than yourself, if any:

CTSM Issues Fixed (include github issue #):
Fixes #2768

Are answers expected to change (and if so in what way)?
No.

Any User Interface Changes (namelist or namelist defaults changes)?
New fsurdat/landuse files added to the defaults.

Does this create a need to change or add documentation? Did you do so?
No.

Testing performed, if any:
On derecho
PASS Test the addition of the new fsurdat/landuse files to the Makefile with

make crop-global-SSP2-4.5-ne3
make crop-global-1850-low-res
make crop-global-present-low-res

PASS ./build-namelist_test.pl (before and after adding ne3np4 tests)
PASS python testing
PASS clm_pymods