Decrease frequency of high temp warnings

Instead of showing any time the temp is above throttling temp,
if the user has dismissed the notification (or clicked it), the notification
will not reshow until the temperature has gone below the throttling
temp and come back.

Test: manual
Change-Id: I4cef9144dfcff03a5e70ccd5b12efaab1e74d15b
Fixes: 34346625