staging: rtl8192e: Remove dead code

Delete unused code. Removed some macros, enums, unions and several
structures (tx_fwinfo, wmm_tspec, qos_tstream, sta_qos, bss_qos).

Signed-off-by: Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>