Backport brcm80211 driver using compat-wireless

http://linuxwireless.org/en/users/Drivers/brcm80211

Thanks to Sympnotic for the point-out!

Change-Id: I7b374bd51eea87a2db88a7bbc766ca122fa44b26

Conflicts:
	Makefile
	arch/arm/boot/compressed/piggy.xzkern