staging: rtl8192e: Remove unused struct rtllib_hdr and two enums

Remove struct rtllib_hdr, enum rt_ps_mode and enum fw_cmd_io_type as those
are not used.

Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/4bdb5e4d604eb3bd46c7853ad6d9a60f6208dd4a.1694792595.git.philipp.g.hortmann@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>