Staging: rtl8187se: use macro IW_HANDLER to initialize r8180_wx_handlers

Use IW_HANDLER to initialize iw_handler structure like in others wireless
driver.

Acked-by: Pablo Neira Ayuso <pablo@gnumonks.org>
Signed-off-by: Ana Rey <anarey@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>