rtl_nic: add new firmware for RTL8402

Add new firmware:
1. rtl_nic/rtl8402-1.fw
   version: 0.0.1
Signed-off-by: Hayes Wang <hayeswang@realtek.com>

WHENCE

@@ -1673,6 +1673,9 @@ Version: 0.0.3
 File: rtl_nic/rtl8411-1.fw
 Version: 0.0.1
 
+File: rtl_nic/rtl8402-1.fw
+Version: 0.0.1
+
 Licence:
  * Copyright © 2011, Realtek Semiconductor Corporation
  *