QCamera2: HAL3: avtimer info is set to backend before stream on

- Currently HAL sends avtimer info after stream_off which is too
  late
- Patch sends avtimer info as a set_param before stream_on when
  avtimer is enabled

Ack-by: Elvice Wu

BUG=29834294

Change-Id: I331c2422a3febaf846085bc7180f27e3cedb54db
1 file changed