Support audioeffects api

[D Black]

DSP Manager is built into many source-built custom ROMs. It would be nice to use to be able to use that as an equalizer if it already exists. Please see https://github.com/Splitter/android_packages_apps_apolloMod or https://github.com/adrian-bl/vanilla/commit/141aef2e272d0b5427cedd27af723e332b61fe76