DynamicsProcessing: Update the Limiter post gain test

This change checks that the output dB value with gain is same as the dB value of full scale sine wave

Bug: 305866207
Test: atest VtsHalDynamicsProcessingTargetTest
Change-Id: I2cee5140a0253011f8e0b9e9c4594e3d30da15f6
2 files changed