[Tizen] Load audio-session-manager library dynamically in the Browser process

This PR includes changes that are needed for generating audio-session-manager
stubs and load the library dynamically in the Browser process.

audio-session-manager is using an _attribute_((constructor)) to initialize code and
setup signal handlers at startup. So, linking with this library is causing a sandbox
violation by executing the code in Renderer Process, since the Renderer Process
and the Browser Process are linked with the same libraries.

To prevent this issue, we load the audio-session-manager library dynamically in
the Browser process.

BUG=https://crosswalk-project.org/jira/browse/XWALK-517