staging: rtl8723bs: remove rtw_is_wps_ie

Remove function rtw_is_wps_ie because it is not used.

Signed-off-by: Nam Cao <namcaov@gmail.com>
Link: https://lore.kernel.org/r/69f128559008c94e29eab511a92964810688288e.1662111799.git.namcaov@gmail.com


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