ARM64: zynqmp: Wire up both USBs available on ZynqMP

The second USB wasn't enabled. This patch fixes it.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/include/configs/xilinx_zynqmp.h b/include/configs/xilinx_zynqmp.h
index c43ea19..ee8d1e0 100644
--- a/include/configs/xilinx_zynqmp.h
+++ b/include/configs/xilinx_zynqmp.h
@@ -108,7 +108,7 @@
 #define CONFIG_SYS_LOAD_ADDR		0x8000000
 
 #if defined(CONFIG_ZYNQMP_USB)
-#define CONFIG_USB_MAX_CONTROLLER_COUNT         1
+#define CONFIG_USB_MAX_CONTROLLER_COUNT         2
 #define CONFIG_SYS_USB_XHCI_MAX_ROOT_PORTS      2
 #define CONFIG_USB_XHCI_ZYNQMP