sched/isolation: Prevent boot crash when the boot CPU is nohz_full

Oleg Nesterovrequested to merge
onestero/centos-stream-9:nohz_boot_cpu_v2 into main

sched/isolation: Prevent boot crash when the boot CPU is nohz_full

JIRA: https://issues.redhat.com/browse/RHEL-30589

Signed-off-by: Oleg Nesterov oleg@redhat.com

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