drm: adv7511: Add link_config variable to struct adv7511_chip_info

The ADV7511 needs link configuration whereas ADV75{33,35} does not need
it. Add a variable link_config to struct adv7511_chip_info to handle
this difference.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Robert Foss <rfoss@kernel.org>
Signed-off-by: Robert Foss <rfoss@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230830142358.275459-8-biju.das.jz@bp.renesas.com