drm/rockchip: cdn-dp: get rid of drm_edid_raw()

The dimensions are available in display info, so there's no need for raw
EDID access. While at it, move the debug logging to where the EDID is
actually read.

Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/d0807fbde7b0bd06ebfcb5df5c3b1cdad4c4ef84.1715691257.git.jani.nikula@intel.com


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