staging: rtl8188eu: Remove function rtw_BT_efuse_map_write()

rtl8188eu is not a wifi/bluetooth combo device, so remove bluetooth
related code.

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