wifi: rtl8192cu, rt2800usb and rtl8712u drivers.

Support Wireless NICs backed by drivers rtl8192cu, rt2800usb and rtl8712u.

For actual list of supported devices look here:

	https://wiki.debian.org/rtl819x#r8712u

and here:

	https://wiki.debian.org/rtl819x#rtl8192cu

and here:

	http://wireless.kernel.org/en/users/Drivers/rt2800usb/devices