staging: rtl8188eu: remove hal_init_macaddr()

Function hal_init_macaddr() just calls rtw_hal_set_hwreg().
Use rtw_hal_set_hwreg() directly and remove hal_init_macaddr().

Signed-off-by: Michael Straube <straube.linux@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>