Merge "Camera: Update physical camera request keys documentation" into rvc-dev

     * The respective value of such request key can be obtained by calling

     * {@link CaptureRequest.Builder#getPhysicalCameraKey }. Capture requests that contain

     * individual physical device requests must be built via

     * {@link android.hardware.camera2.CameraDevice#createCaptureRequest(int, Set)}.

     * Such extended capture requests can be passed only to

     * {@link CameraCaptureSession#capture } or {@link CameraCaptureSession#captureBurst } and

     * not to {@link CameraCaptureSession#setRepeatingRequest } or

     * {@link CameraCaptureSession#setRepeatingBurst }.</p>

     * {@link android.hardware.camera2.CameraDevice#createCaptureRequest(int, Set)}.</p>

     *

     * <p>The list returned is not modifiable, so any attempts to modify it will throw

     * a {@code UnsupportedOperationException}.</p>