DRAFT: Bring in gpuized RRTMGP

[peverwhee]

DRAFT UNTIL #439 IS MERGED (this branch also contains those changes)

Tag name (required for release branches): TBD
Originator(s): peverwhee

Description (include the issue title, and the keyword ['closes', 'fixes', 'resolves'] followed by the issue number):

• Brings in GPUized schemes for RRTMGP via atmospheric physics
• New mods to appease the NVHPC compiler in CAM-SIMA
• Adds new test for GPUized RRTMGP (NOTE: currently using a CPU snapshot - until I can reliably run GPUized RRTMGP in CAM again)

Describe any changes made to build system:

Describe any changes made to the namelist: n/a

List any changes to the defaults for the input datasets (e.g. boundary datasets): n/a

List all files eliminated and why: n/a

List all files added and what they do:
A cime_config/testdefs/testmods_dirs/cam/outfrq_rrtmgp_derecho_gpu/shell_commands
A cime_config/testdefs/testmods_dirs/cam/outfrq_rrtmgp_derecho_gpu/user_nl_cam
A cime_config/testdefs/testmods_dirs/cam/outfrq_rrtmgp_derecho_gpu/user_nl_cpl

• Bring in test mods for GPUized RRTMGP test

List all existing files that have been modified, and describe the changes:
(Helpful git command: git diff --name-status development...<your_branch_name>)
M .gitmodules
M src/physics/ncar_ccpp

• bring in updated atmospheric_physics submodule

M src/core_utils/string_core_utils.F90
M src/history/cam_history_support.F90

• mods to appease the nvhpc compiler

If there are new failures (compared to the test/existing-test-failures.txt file),
have them OK'd by the gatekeeper, note them here, and add them to the file.
If there are baseline differences, include the test and the reason for the
diff. What is the nature of the change? Roundoff?

derecho/intel/aux_sima: b4b

derecho/gnu/aux_sima: b4b

derecho/nvhpc/aux_sima: new baseline

If this changes climate describe any run(s) done to evaluate the new
climate in enough detail that it(they) could be reproduced:

CAM-SIMA date used for the baseline comparison tests if different than latest: