Implemented new approach for Bluetooth service discovery

Using bt_rdev_sdp_search_async function from NDK btdevice.h header. This will provide option to obtain more information about the service for 10.2.1 NDK and image versions.

Change-Id: I372ebc0247a8474360ac291fe0215b6a0be59a15
Reviewed-by: Fabian Bumberger <fbumberger@rim.com>
Reviewed-by: Alex Blasche <alexander.blasche@digia.com>