utils/cpustates: update idle state naming
utils/cpustates: update idle state naming

If idle state names for a cpu could not be discovered, use "idle[N]"
where N is the state number, instead of just making them all as
"unknown".

setrofim/workload-automation,ARM-software/workload-automation,setrofim/workload-automation,ARM-software/workload-automation,setrofim/workload-automation,setrofim/workload-automation,ARM-software/workload-automation,ARM-software/workload-automation