Modify logic for related topic.

Modify logic for related topic.

this patch included,
1. Modify logic for NSSendTopicList.
2-1. change NSProviderTopicListSize to NSProviderGetTopicListSize.
2-2. and move NSProviderMemoryCache to NSProviderTopic.c
3. rename Function for NSProviderRegisterTopic.

Change-Id: I829435e5504b117f1f4d71453b5c9ca6ab02c511
Signed-off-by: jaesick.shin <jaesick.shin@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/11101
Reviewed-by: Uze Choi <uzchoi@samsung.com>
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>