Camera: Clarify multi-camera RAW and FOV behaviors

- RAW capability can exist for multi-camera even if physical cameras are
of different sizes/capabilities.
- FOV for all processes streams must be the same regardless of logical
or physical streams.
- All metadata tags related to pixelArray/preCorrectionActiveArray/activeArray
needs to be mapped properly by the camera HAL.
- Do distortion correction mapping for physical subcamera as well.

Test: Build and read docs, camera CTS, ITS.
Bug: 118906351
Bug: 126220135

Change-Id: I29a61fc3a603561c1d74dc2261600ce4cd3d34cd