DynamicsProcessing: Add test for MBC band post gain parameter

This 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: I06c42a1fcfc0d2f33030a64a5c5c151f9a1129fb
1 file changed