nohz: Fix another inconsistency between CONFIG_NO_HZ=n and nohz=off

Change-Id: I6321b265d07518169bc7c10926035e3063089496
Revert "tick-sched: recalculate sleep length each time it is requested"

This reverts commit 1c0a4128e47a7673e6e1347ce6dc40427ccc4a16.

Change-Id: I1641b7a9b7f486386a3a2c33683306448ceb8a94