libcamera: ipu3: Use the optimal sensor size

As reported by commit 7208e70211a6 ("libcamera: ipu3: Always use sensor
full frame size") the current implementation of the IPU3 pipeline
handler always uses the sensor resolution as the ImgU input frame size in
order to work around an issue with the ImgU configuration procedure.

Now that the frame selection policy has been modified in the CIO2Device
class implementation to comply with the requirements of the ImgU
configuration script we can remove the workaround and select the most
opportune sensor size to feed the ImgU with.

Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

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