drm: renesas: shmobile: Don't set display info width and height twice

drm: renesas: shmobile: Don't set display info width and height twice

The display info width_mm and height_mm fields are set at init time and
never overwritten, don't set them a second time when getting modes.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Sui Jingfeng <suijingfeng@loongson.cn>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/edd49fcb92af83d81df655b3db1685e8ed14380a.1694767209.git.geert+renesas@glider.be