Camera: Wait for draw done before restarting preview

This makes sure no draw complete signal is bleeded into
next iteration of test.

As a result, we don't need to manually reset drawDone before
each of the test iteration.

Test: vendor test, Camera CTS on Pixels
Bug: 240887956
Bug: 241819509
Change-Id: Iaa9a18f03279cdf54efc4b384fca448777f3572a
1 file changed