Fix memory issue on calling C APIs at Cpp layer.

Fix memory issue on calling C APIs at Cpp layer.

When the calling APIs with NSProvider parameter at Cpp layer,
lead to crash by illegal access of memory.
This problem is due to type-cast of NSProvider between NSProvider_internal.
So, type-casting of structure is removed.

Conflicts:
	service/notification/src/consumer/NSConsumerCommunication.c
	service/notification/src/consumer/NSConsumerInterface.c
	service/notification/src/consumer/NSConsumerInternalTaskController.c

Change-Id: I32c61b56510886f9f3be341d2ba497e211f0cad6
Signed-off-by: KIM JungYong <jyong2.kim@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/10487
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Uze Choi <uzchoi@samsung.com>
Tested-by: Uze Choi <uzchoi@samsung.com>