drm: mali-dp: Report writeback connector as connected

Older version of this patch series reported writeback as disconnected
to avoid confusing userspace not aware of writeback connectors.
However, the version that got merged uses a special cap
(DRM_CLIENT_CAP_WRITEBACK_CONNECTORS) for this purpose.

This helps us avoid some special handling of writeback connector
in drm_helper_probe_single_connector_modes, see [1].

https://lists.freedesktop.org/archives/dri-devel/2018-July/183144.htmlSigned-off-by: NAlexandru Gheorghe <alexandru-cosmin.gheorghe@arm.com>
Reviewed-by: NSean Paul <seanpaul@chromium.org>
Signed-off-by: NLiviu Dudau <liviu.dudau@arm.com>

drivers/gpu/drm/arm/malidp_mw.c

@@ -73,7 +73,7 @@ static void malidp_mw_connector_reset(struct drm_connector *connector)
 static enum drm_connector_status
 malidp_mw_connector_detect(struct drm_connector *connector, bool force)
 {
-	return connector_status_disconnected;
+	return connector_status_connected;
 }
 
 static void malidp_mw_connector_destroy(struct drm_connector *connector)