staging: rtl8188eu: Remove function netdev_br_init()

netdev_br_init() tries to find MAC address of network interface named "br0",
then that MAC address is assigned to adapter->br_netdev and used by driver's
NAT implementation code.

Signed-off-by: navin patidar <navin.patidar@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>