staging: rtl8192e: remove dead code rtllib_wpa_supplicant_ioctl

Following removal of _rtl92e_ioctl this function along with associated
macros, structure ieee_param and functions become dead code.

Remove functions rtllib_wpa_enable, rtllib_wpa_assoc_frame, rtllib_wpa_mlme,
rtllib_wpa_set_wpa_ie, rtllib_wpa_set_auth_algs, rtllib_wpa_set_param,
rtllib_wpa_set_encryption and rtllib_wpa_supplicant_ioctl.

Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>