Merge branch 'singhbalwinder/machine/update-compy-mkl' (PR #6997)

The older version of MKL (mkl/2019u5) produced linking errors
with the EAMxx test-all-scream script.
The new version (mkl/2020) fixes these errors.

[NBFB] possibly for compy only

* singhbalwinder/machine/update-compy-mkl:
  Updates Intel's  MKL version to mkl/2020 on Compy

Author: singhbalwinder

cime_config/machines/config_machines.xml

@@ -3873,7 +3873,7 @@
       <modules>
         <command name="load">netcdf/4.6.3</command>
         <command name="load">pnetcdf/1.9.0</command>
-        <command name="load">mkl/2019u5</command>
+        <command name="load">mkl/2020</command>
       </modules>
     </module_system>
     <RUNDIR>$CIME_OUTPUT_ROOT/$CASE/run</RUNDIR>