rcutorture: Fix ksoftirqd boosting timing and iteration
This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v5.15.61 by commit 621595f771a6bd458ffbc40679e222ba5d0a7a1e, it was introduced in version v5.14 by commit ea6d962e80b61996aeacb443661cc3adcb605315. For more details please see the references link.