Fix issue 2667796: [Audio Effect Framework] Effect factory and libraries.

First effect factory and effect library API implementation.
Also added default effect libraries for reverb and equalizer effects.
These libraries are for functional test only and are not fine tuned with
regard to audio quality. They will probably be replaced by other implementations
before the release.

Change-Id: I6868f8612146ae282c64052765c61a52ec789ec8