[IOT-1955] Notification service fails to load libca-interface.so

[IOT-1955] Notification service fails to load libca-interface.so

Changes are made to add libca-interface.so to service/notification. This library
requires libresource_directory.so and hence added that.
Changes added in build.gradle to avoid duplicates.

Change-Id: I0a40aa9fdb726fb7a1e778ff63155d78ffde21f6
Signed-off-by: Poovizhi <poovizhi.a@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/18133
Tested-by: jenkins-iotivity <jenkins@iotivity.org>
Reviewed-by: Uze Choi <uzchoi@samsung.com>