staging: r8188eu: Remove wrappers _rtw_free_sema, _rtw_up_sema, and _rtw_mutex_init

Any routines that are empty as a result of these changes are also removed.

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>