libcamera: rpi: Simplify validate() and configure() for RAW streams

This commit simplifies the validate() and configure() calls in the
pipeline handler in a number of ways:

- Only pass the RPiCameraConfiguration structure into platformValidate()
  and platformConfigure().

- Determine the V4L2DeviceFormat structure fields for all streams in
  validate(), cache them and reuse in configure() instead of
  re-generating this structure multiple times.

- Use the recently added updateStreamConfig() and toV4L2DeviceFormat()
  helpers to populate fields in the V4L2DeviceFormat and
  StreamConfiguration structures to reduce code duplication.

Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

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