common: board_r: Drop initr_xen wrapper

Add a return value to xen_init and use it directly in the
post-relocation init sequence, rather than using a wrapper stub.

Signed-off-by: Ovidiu Panait <ovidiu.panait@windriver.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/xen/hypervisor.c b/drivers/xen/hypervisor.c
index 178c206..2560894 100644
--- a/drivers/xen/hypervisor.c
+++ b/drivers/xen/hypervisor.c
@@ -232,7 +232,7 @@
 	synch_clear_bit(port, &s->evtchn_pending[0]);
 }
 
-void xen_init(void)
+int xen_init(void)
 {
 	debug("%s\n", __func__);
 
@@ -240,6 +240,8 @@
 	init_events();
 	init_xenbus();
 	init_gnttab();
+
+	return 0;
 }
 
 void xen_fini(void)