drm/edid: add drm_edid helper for drm_update_tile_info()

We'll need to propagate drm_edid everywhere.

v2: Handle NULL EDID pointer (Ville, CI)

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/5b36683b656446a4d9a172d4dca1cf9aca08a48b.1652097712.git.jani.nikula@intel.com