profcollect: Trace on camera open events

This allows us to collect traces for camera related libraries, like
libg3a. For the initial experiment, we collect the traces one second
after the camera opens. We can fine tune this or switch to other
triggers once we have the benchmark numbers.

Test: manual
Bug: 319394981
Change-Id: Ia65694602af1054dd261f4e72c1c3f82056eb1e3