Camera2Client: Revert HALv2 device behavior back to MR2

- Do not idle device before video snapshot stream configuration, to
  avoid deadlock during waiting.
- Do not tear down ZSL stream
- Don't refresh ZSL stream after deletion was requested.
  The v2 HAL implementations really don't like the ZSL stream being
  touched ever.

Bug: 17634430
Bug: 17628507

Change-Id: I36b44a395e697be9802c4bd917a82b77c8d04be2