Update build scons for notificaiton android sample.

Update build scons for notificaiton android sample.

When building notification service on android,
was built just aar file but sample apk.
In this patch building android will be built aar file and sample apk.

Conflicts:
        service/notification/examples/android/NotiConsumerExample/app/build.gradle

Change-Id: I32b9e06600e9063bc8115cd7302c73c938d14e8f
Signed-off-by: KIM JungYong <jyong2.kim@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/12975
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Uze Choi <uzchoi@samsung.com>