pipeline: rkisp1: Keep aspect ratio on imx8mp

In the current code, the input stage of the image resizer is used to
apply a crop to keep the aspect ratio in cases where the requested
output aspect ratio differs from the one of the selected sensor mode. On
the imx8mp the resizer hardware is not capable of cropping (for
reference see also rkisp1-resizer.c:rkisp1_rsz_set_sink_crop() in the
linux kernel v6.10).

Therefore apply the necessary cropping on the output of the ISP (on the
image stabilization block). The cropping code on the image resizer
doesn't need modifications as the requested crop gets ignored by the
kernel.

While at it, remove a todo comment that is no longer needed.

Signed-off-by: Stefan Klug <stefan.klug@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>

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