Added tests for audio effects in MediaFrameworkTest

This CL adds a set of automated functional tests for the AudioEffect class
and the following derived classes:
BassBoost, Equalizer, Virtualizer and Visualizer.

These tests require the following file on the SD card:
/sdcard/media_api/music/sine_200+1000Hz_44K_mo.wav

Change-Id: I6ec3ec6f9ede10ccf2dd3b1e9ee4b08396740dee