[qtlicd] many wakeups when idle

apple's activity monitor shows that qtlicd wakes up 50something times per second (third after kernel and WindowServer on an idle system). the daemon should only wake up when it has actual work to be done. see attached screenshot. i'm seeing this in v3.4.0 (From revision: b015d716bcaf1fba8b3bdf41b900fa1c63e5275a), so it should have the fix for QLS-1730.

as a side note, the daemon should probably run with QThread::QualityOfService::Eco to favor efficiency cores