updates to maint-2.1 for pm-cpu that were made to master #6158
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Only affecting pm-cpu. No module version changes (except for updates to AMD compiler) and should be BFB.
Primary change is adjusting PE layouts to remove CPL_PSTRID=8 hack as the performance issue with communication has been resolved and is no longer needed. The following 2 PR's describe most of these changes:
#5971
#6003
Also included a bugfix made in the PR below to allow e3sm_prod suite to pass.
#5811
[bfb]