configs: rk3328: config xhci controller

Add config of max root ports and add config to enable xhci
controller.

Signed-off-by: Meng Dongyang <daniel.meng@rock-chips.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/include/configs/rk3328_common.h b/include/configs/rk3328_common.h
index 9cfeab8..5a06244 100644
--- a/include/configs/rk3328_common.h
+++ b/include/configs/rk3328_common.h
@@ -62,4 +62,7 @@
 /* rockchip ohci host driver */
 #define CONFIG_USB_OHCI_NEW
 #define CONFIG_SYS_USB_OHCI_MAX_ROOT_PORTS	1
+
+/* xhci host */
+#define CONFIG_SYS_USB_XHCI_MAX_ROOT_PORTS	2
 #endif