NFD - cstate detection enabled on s390x

Description of problem:
When running NFD on OCP 4.9 you can see in the logs that it is trying and failling to detect cstate on s390x.

I0812 09:08:40.750590 1 nfd-worker.go:422] configuration file "/etc/kubernetes/node-feature-discovery/nfd-worker.conf" parsed
I0812 09:08:40.750646 1 nfd-worker.go:457] worker (re-)configuration successfully completed
I0812 09:08:40.750690 1 nfd-worker.go:468] starting feature discovery...
E0812 09:08:40.750897 1 cpu.go:150] failed to detect cstate: cannot get driver for cpuidle: open /host-sys/devices/system/cpu/cpuidle/current_driver: no such file or directory
I0812 09:08:40.756227 1 nfd-worker.go:480] feature discovery completed
I0812 09:08:40.756258 1 nfd-worker.go:550] sending labeling request to nfd-master

Version-Release number of selected component (if applicable):
OCP 4.9.0-0.nightly-s390x-2021-08-04-204925
NFD 4.9.0-202107210242

How reproducible:

Steps to Reproduce:
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Actual results:
Trying and failing to detect cstate

Expected results:
Not trying to detect cstate on s390x.

Additional info: