media: rzg2l-cru: Inline calculating image size

media: rzg2l-cru: Inline calculating image size

Inline the `rzg2l_cru_format_sizeimage()` function into its single
caller as the function is trivial and is not expected to be called
anywhere else.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Link: https://lore.kernel.org/r/20241018133446.223516-13-prabhakar.mahadev-lad.rj@bp.renesas.com
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>