staging: rtl8723bs: Remove Dead Code in os_dep/ioctl_linux.c

Remove Dead Code in `static int rtw_wps_start`,
`struct iw_handler rtw_private_handler[]` and
`struct iw_priv_args rtw_private_args[]` since they use the Macro
CONFIG_INTEL_WIDI witch doesn't exists any more.

Signed-off-by: Emanuel Bennici <benniciemanuel78@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>