rename function for NSStoreTopics and Add NSDeleteTopics Function.

rename function for NSStoreTopics and Add NSDeleteTopics Function.

this patch included
change NSStoreTopics Function name to NSAddTopics.
add NSDeleteTopics Function(only function)
next commit, i will add logic.

second patch included
remove not required define for NSStoreTopics.

Change-Id: I3ab2a910de12a252a4fd82edd22bcdf0c65ca87a
Signed-off-by: jaesick.shin <jaesick.shin@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/10281
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Madan Lanka <lanka.madan@samsung.com>