Camera2: Connect camera parameters to HAL request entries.

- All fields in Camera.Parameters are mapped to HAL2 entries, and
  communicated to the HAL.

- Preview stream properly updated on parameter changes

- Slight code rearrangment for improved clarity

Bug: 6243944
Change-Id: I2a1db5c148809a62ba3524fb659dd6065affff8e
2 files changed