OCPBUGS_45910: Fix cpu clockspeed for s390x

[apodvrat]

For s390x architectures lscpu does not return the clock speed by "CPU MHz" or "CPU max MHz" field but have two fields (CPU static MHz and CPU dynamic MHz).
"CPU static MHz" is the field representing the designed clock speed whereas the "CPU dynamic MHz" is representing the current CPU speed (throttled or energy saving).
New test case for s390x architecture was added.
In addition the machine type was fixed, too.

The fix was tested using unit tests:

JUnit path was configured: ./junit_unit_test.xml

JUnit report was created: /root/code/Assisted_Installer/latest/assisted-installer-agent/src/inventory/junit_unit_test.xml

Ran 121 of 121 Specs in 0.268 seconds
SUCCESS! -- 121 Passed | 0 Failed | 0 Pending | 0 Skipped
--- PASS: TestInventory (0.30s)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.49%. Comparing base (ecb65f1) to head (914474f).
Report is 7 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #857      +/-   ##
==========================================
- Coverage   60.54%   60.49%   -0.06%     
==========================================
  Files          75       75              
  Lines        3992     3992              
==========================================
- Hits         2417     2415       -2     
- Misses       1405     1406       +1     
- Partials      170      171       +1     

Files with missing lines	Coverage Δ
src/inventory/cpu.go	93.10% <100.00%> (ø)

... and 1 file with indirect coverage changes

[AmadeusPodvratnik]

/retest

[AmadeusPodvratnik]

/retest

[apodvrat]

/retest

[apodvrat]

/retest

[AmadeusPodvratnik]

/retest

[openshift-ci]

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[apodvrat]

/retest

[openshift-ci]

@apodvrat: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/edge-e2e-oci-assisted-4-18	914474f	link	false	/test edge-e2e-oci-assisted-4-18
ci/prow/okd-scos-e2e-aws-ovn	914474f	link	false	/test okd-scos-e2e-aws-ovn

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