LoudnessEnhancer: Add AIDL implementation and its unit test

Added AIDL implementation for LoudnessEnhancer audio effect
parameters and its unit test.

Bug: 258124419
Test: atest VtsHalLoudnessEnhancerTargetTest

Change-Id: I2dfd304ca9f72383572fd1f762d41864dd73e39d
4 files changed