drm/edid: Clear the old cea_rev when there's no CEA extension in the new EDID

It's not a good idea to leave stale cea_rev in the drm_display_info. The
current EDID might not even have a CEA ext block in which case we'd end
up leaving the stale value in place.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Acked-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1475070703-6435-8-git-send-email-ville.syrjala@linux.intel.com

drivers/gpu/drm/drm_edid.c

@@ -3844,6 +3844,7 @@ static void drm_add_display_info(struct drm_connector *connector,
 	/* driver figures it out in this case */
 	info->bpc = 0;
 	info->color_formats = 0;
+	info->cea_rev = 0;
 
 	if (edid->revision < 3)
 		return;