cameraserver: Make trace points in HFR code paths optional.

Per processCaptureResult save 4 trace point costs -> approximately 2%of 4ms budget.
Save 2 trace points per processCaptureRequest call.

[assuming each trace point costs around 10us]

Bug: 155910869

Test: Try HFR; record perfetto trace, make sure trace points opted out
      don't appear

Change-Id: Ifcfec6e0d5a40958cd4f84734b6be094afaa4f17
Signed-off-by: Jayant Chowdhary <jchowdhary@google.com>