[IOT-1669] Fixing Notification-service Android API's formatting issue.

[IOT-1669] Fixing Notification-service Android API's formatting issue.

Proper allignment of braces and  Modified comments from doxygen format to javadoc.

Patch 4: Applied formatter from iotivity/tools/styles
Patch 5:  Resolve conflict due to merge of
	https://gerrit.iotivity.org/gerrit/#/c/15497/

Change-Id: I406fb56aad290f06cb0094c09041b13142aed350
Signed-off-by: nikhil.a <nikhil.a7@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/15457
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Uze Choi <uzchoi@samsung.com>