modules: Add support for Realtek r8712 and RTL8192SU.

This patch adds support for Realtek r8712 and RTL8188SU/RTL8191SU/RTL8192SU
family of fullmac usb wireless cards. The r8712u staging driver only supports
WEXT but works with no problems in OpenWRT.

Signed off by: José Vázquez Fernández <ppvazquezfer@gmail.com>

SVN-Revision: 44184