Added JAVA classes to control bass boost, equalizer, reverberation and virtualizer Effects.

Defined the following JAVA classes on top of AudioEffect class to facilitate control
off built-in audio effects with APIs aligned with interfaces defined in OpenSL ES
specification:
- BastBoot.java
- Equalizer.java
- PresetReverb.java
- EnvironmentalReverb.java
- Virtualizer.java

Split reverb API header file in two, one for preset reverb and one for environmental reverb.
Some changes in test reverb to support preset reverb.

Change-Id: Ie0a5ba06002e63dfd6da22cace5568c1e0b76ea1