Revert "cpuidle: remove cross-cpu IPI by new latency request."

This reverts commit b9cabea2a5a5b0fda3b544ceb5c7060f393b3438.
Revert "cpuidle: make a single register function for all"

This reverts commit fe91ba3ea368fdd933742c49f31d5596fd9d3a7f.