drm/edid: group struct drm_edid based declarations together

Keep the declarations for struct drm_edid based functions together.

Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/2634de73734dfbf0a772511a80eab966c8206cf2.1713259151.git.jani.nikula@intel.com


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