drm/edid: debug log EDID override set/reset

It's useful debugging information to know if and when an override EDID
was set or reset.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/ae352f542b4d69398c0965e33fb2e6e34156cbfb.1666614699.git.jani.nikula@intel.com