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#/kv0/enc=false/nodes=3/cpu=32/size=64kb/splt=100) on master @ [5dd5d5a09e7655742e7cb93329bf711c9b2603cb](https://github.com/cockroachdb/cockroach/commits/5dd5d5a09e7655742e7cb93329bf711c9b2603cb):

```
test kv0/enc=false/nodes=3/cpu=32/size=64kb/splt=100 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

[This test on roachdash](https://roachdash.crdb.dev/?filter=status:open%20t:.*cluster_creation.*&sort=title+created&display=lastcommented+project) | [Improve this report!](https://github.com/cockroachdb/cockroach/tree/master/pkg/cmd/bazci/githubpost/issues)

Jira issue: CRDB-61480

Start with the linked TeamCity log and the roachtest README, then inspect test_runner.go:998, where the invalid IBM CPU count is reported. Determine why cluster_creation requests 32 CPUs for IBM and verify the fix by rerunning the affected roachtest configuration until it passes.

Written by the indexing model from the issue text.