roachtest: cluster_creation failed

roachtest.cluster_creation [failed](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_Roachtests_RoachtestNightlyIbmBazel/21244865?buildTab=log) with [artifacts](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_Roachtests_RoachtestNightlyIbmBazel/21244865?buildTab=artifacts#/kv95/enc=false/nodes=3/cpu=32/size=4kb) on master @ [5dd5d5a09e7655742e7cb93329bf711c9b2603cb](https://github.com/cockroachdb/cockroach/commits/5dd5d5a09e7655742e7cb93329bf711c9b2603cb):

```
test kv95/enc=false/nodes=3/cpu=32/size=4kb failed: (test_runner.go:998).func4: invalid number of cpus 32 for IBM [owner=test-eng]
```

Parameters:
- cloud=ibm
- coverageBuild=false
- cpu=32
- diskCount=0
- runtimeAssertionsBuild=false
Help

See: [roachtest README](https://github.com/cockroachdb/cockroach/blob/master/pkg/cmd/roachtest/README.md)

See: [How To Investigate \(internal\)](https://cockroachlabs.atlassian.net/l/c/SSSBr8c7)

/cc @cockroachdb/test-eng

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Jira issue: CRDB-61502

Start with the roachtest README and the failure at test_runner.go:998, then inspect the linked TeamCity build log and artifacts for the IBM cluster_creation run. Determine why cpu=32 is rejected for IBM and verify that the kv95 cluster_creation case can run with valid CPU parameters.

Written by the indexing model from the issue text.