ipa: ipu3: Rework IPAFrameContext

Currently, IPAFrameContext consolidates the values computed by the
active state of the algorithms, along with the values applied on
the sensor.

Moving ahead, we want to have a frame context associated with each
incoming request (or frame to be captured). This shouldn't necessarily
be tied to "active state" of the algorithms hence:

- Rename current IPAFrameContext -> IPAActiveState
  This will now reflect the latest active state of the algorithms and
  has nothing to do with any frame-related ops/values.

- Re-instate IPAFrameContext with a sub-structure 'sensor' currently
  storing the exposure and gain value.

Adapt the various access to the frame context to the new changes
as described above.

Subsequently, the re-instated IPAFrameContext will be extended to
contain a frame number and ControlList to remember the incoming
request controls provided by the application. A ring-buffer will
be introduced to store these frame contexts for a certain number
of frames.

Signed-off-by: Umang Jain <umang.jain@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

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