Increase cameraserver fuzz test timeout to 770 seconds.

Some devices cannot complete executing a single instance of the test
within the default alloted time-out.

Bug: 187360866

Test: N / A yet; wait for time-outs to disappear from haiku

Change-Id: I1c7db3ea6eb1b59e590a71bfd8316cc5d1db40ad
Signed-off-by: Jayant Chowdhary <jchowdhary@google.com>