delete wifi API and pkg config in tizen.

delete wifi API and pkg config in tizen.

since IoTivity already use Tizen Connectivity Manager API instead of wifi API.
it should be removed in this and there.

Change-Id: I9a61d7d4d323fe83e988c792284179c099bc2855
Signed-off-by: jihwan.seo <jihwan.seo@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/17079
Tested-by: jenkins-iotivity <jenkins@iotivity.org>
Reviewed-by: Dan Mihai <Daniel.Mihai@microsoft.com>