rtwn/usb: add product ID for Asus USB N10 Nano Rev. B1

According to information found on the internet the following products
use exactly the same hardware but probably different USB IDs:

• Edimax EW-7811Un V2 (v2)
• Edimax EW-7811GLN 2.0A (v2)

I am not adding them as I cannot verify.

PR: 254280
MFC after: 1 week