usb: cdns3: Fix include file path

xhci.h has now been moved to include/usb/ directory. Therefore, update the
path in the Cadence USB drivers.

Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
diff --git a/drivers/usb/cdns3/host.c b/drivers/usb/cdns3/host.c
index 79be630..425d9d0 100644
--- a/drivers/usb/cdns3/host.c
+++ b/drivers/usb/cdns3/host.c
@@ -11,7 +11,7 @@
 #include <dm.h>
 #include <linux/compat.h>
 #include <usb.h>
-#include "../host/xhci.h"
+#include <usb/xhci.h>
 
 #include "core.h"
 #include "drd.h"