kernel/hung_task: ensure that critical processes aren't frozen

* these processes are critical and necessary to be running all the time, ensure that these processes aren't frozen to avoid regressions.

Change-Id: I6d340f18bbc0edbdf2f6ec83a840ac00c7f6865c
Signed-off-by: minaripenguin <minaripenguin@users.noreply.github.com>