DynamicsProcessing: Add pre and post equalizer test

This test adds gain to only one band at a time.
Compares that the magnitude at one band is less than or greater than the
other based on the gain dB values.

Bug: 305866207
Test: atest VtsHalDynamicsProcessingTargetTest
Change-Id: I7f64085cd7a767ce400c1a8bdeb6fd7ae01bd9ef