drm/rockchip: cdn-dp: switch to struct drm_edid

Prefer struct drm_edid based functions over struct edid.

Acked-by: Heiko Stuebner <heiko@sntech.de>
Link: https://patchwork.freedesktop.org/patch/msgid/59d2feb9f8b28d1a1cf49077a35941aa9b3d36af.1713273659.git.jani.nikula@intel.com


Signed-off-by: Jani Nikula <jani.nikula@intel.com>