staging: r8188eu: clean up rtw_ioctl.h

There are lots of unused macros, structs, etc. in the header
rtw_ioctl.h. Remove them.

Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20220407192819.10661-9-straube.linux@gmail.com


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