CSD: add timeout of 20h after momentary exposure

Introduced a momentary exposure warning timeout when listening above
RS2. This will disable consecutive warnings if user does not take action
and lower the volume.

Test: manual testing
Bug: 269742095
Change-Id: I6941d65bd297b277023cb592e393ba4542a9b752
Merged-In: I6941d65bd297b277023cb592e393ba4542a9b752