IOT-1877 : start presence issue

IOT-1877 : start presence issue

When called OCStartPresence() second, OCStartPresence() returns error.
Fixed presenceState variable to OC_PRESENCE_UNINITIALIZED.

Change-Id: I089c826f4105eb3aaf835a8feda4c10b848ebd5d
Signed-off-by: ChaJiWon <jw_wonny.cha@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/17623
Tested-by: jenkins-iotivity <jenkins@iotivity.org>
Reviewed-by: Phil Coval <philippe.coval@osg.samsung.com>
Reviewed-by: Jaehong Jo <jaehong.jo@samsung.com>
Reviewed-by: jihwan seo <jihwan.seo@samsung.com>
Reviewed-by: Way Vadhanasin <wayvad@microsoft.com>
Reviewed-by: Dan Mihai <Daniel.Mihai@microsoft.com>
(cherry picked from commit 2f11e9592a7374ce28082a523b0c367a6d31baee)
Reviewed-on: https://gerrit.iotivity.org/gerrit/17775