With the changes in https://github.com/openshift/machine-config-operator/pull/4425, RHEL worker nodes fail as follows:

[root@ptalgulk-0807c-fq97t-w-a-l-rhel-1 cloud-user]# systemctl --failed
  UNIT                  LOAD   ACTIVE SUB    DESCRIPTION                
● disable-mglru.service loaded failed failed Disables MGLRU on Openshfit

LOAD   = Reflects whether the unit definition was properly loaded.
ACTIVE = The high-level unit activation state, i.e. generalization of SUB.
SUB    = The low-level unit activation state, values depend on unit type.

1 loaded units listed. Pass --all to see loaded but inactive units, too.
To show all installed unit files use 'systemctl list-unit-files'.
[root@ptalgulk-0807c-fq97t-w-a-l-rhel-1 cloud-user]# journalctl -u disable-mglru.service
-- Logs begin at Mon 2024-07-08 06:23:03 UTC, end at Mon 2024-07-08 08:31:35 UTC. --
Jul 08 06:23:14 localhost.localdomain systemd[1]: Starting Disables MGLRU on Openshfit...
Jul 08 06:23:14 localhost.localdomain bash[710]: /usr/bin/bash: /sys/kernel/mm/lru_gen/enabled: No such file or directory
Jul 08 06:23:14 localhost.localdomain systemd[1]: disable-mglru.service: Main process exited, code=exited, status=1/FAILURE
Jul 08 06:23:14 localhost.localdomain systemd[1]: disable-mglru.service: Failed with result 'exit-code'.
Jul 08 06:23:14 localhost.localdomain systemd[1]: Failed to start Disables MGLRU on Openshfit.
Jul 08 06:23:14 localhost.localdomain systemd[1]: disable-mglru.service: Consumed 4ms CPU time

We should only disable mglru if it exists.

    4.16, 4.17

    Attempt to bring up rhel worker node

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