drm: xlnx: zynqmp_dpsub: fix hotplug detection

drm_kms_helper_poll_init needs to be called after zynqmp_dpsub_kms_init.
zynqmp_dpsub_kms_init creates the connector and without it we don't
enable hotplug detection.

Fixes: eb2d64b ("drm: xlnx: zynqmp_dpsub: Report HPD through the bridge")
Cc: stable@vger.kernel.org
Signed-off-by: Steffen Dirkwinkel <s.dirkwinkel@beckhoff.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241028134218.54727-1-lists@steffen.cc

drivers/gpu/drm/xlnx/zynqmp_kms.c

@@ -511,12 +511,12 @@ int zynqmp_dpsub_drm_init(struct zynqmp_dpsub *dpsub)
 	if (ret)
 		return ret;
 
-	drm_kms_helper_poll_init(drm);
-
 	ret = zynqmp_dpsub_kms_init(dpsub);
 	if (ret < 0)
 		goto err_poll_fini;
 
+	drm_kms_helper_poll_init(drm);
+
 	/* Reset all components and register the DRM device. */
 	drm_mode_config_reset(drm);