Fix return type to enable callback.

Fix return type to enable callback.

UpdateResponseAddr() did not set success as result which caused the
stack to return quietly.
Set response type to OC_STACK_OK so stack can do the callback.

Change-Id: I3958c51f08735d2e7bf30bcefdfbb99255ea69bf
Signed-off-by: Mandeep Shetty <mandeep.shetty@intel.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/587
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Joseph Morrow <joseph.l.morrow@intel.com>
Reviewed-by: Erich Keane <erich.keane@intel.com>