DynamicsProcessing: Add test for link group parameter

These tests verify the outputs for :
1. Same link group with different threshold and ratio configs-
	Validate that the output has max attenuation.
2. Different link groups with different threshold and ratio configs-
	Validate that each channel has different attenuation levels.

Bug: 305866207
Test: atest VtsHalDynamicsProcessingTargetTest
Change-Id: Iebdb4816b0019189e91cf28eba83babf002ae431