Add bcmdhd driver from linux-sunxi in kernel tree, reincorporate rkwifi and wifi_sys stuff and reenable WIFI_CONTROL, WIFI_CONTROL_FUNC and WIFI_COMBO_MODULE_CONTROL_FUNC in arch/arm/plat-rk/Kconfig so arch/arm/{mach-rk30,mach-rk3188,plat-rk} wifi related code will trigger