ARM64: zynqmp: Record board name as serial number for DFU/FASTBOOT

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/board/xilinx/zynqmp/zynqmp.c b/board/xilinx/zynqmp/zynqmp.c
index b0acaa5..7e67288 100644
--- a/board/xilinx/zynqmp/zynqmp.c
+++ b/board/xilinx/zynqmp/zynqmp.c
@@ -422,6 +422,10 @@
 {
 	debug("%s: index %x\n", __func__, index);
 
+#if defined(CONFIG_USB_GADGET_DOWNLOAD)
+	g_dnl_set_serialnumber(CONFIG_SYS_CONFIG_NAME);
+#endif
+
 	switch (index) {
 	case 0:
 		return dwc3_uboot_init(&dwc3_device_data0);