LoudnessEnhancer: Added test cases to validate effect processing.

Added test to verify increase in loudness with gains.
Added test to verify that outputs are 0 for INT_MIN gain value.

Bug: 305866207
Test: atest VtsHalLoudnessEnhancerTargetTest
Change-Id: I6e87f5bf6f268980b6cc9af4b7a191657f117eb5
1 file changed