add libeffectproxy for audio effects offloading
add libeffectproxy for audio effects offloading

libeffectproxy is used when offloading audio effects to
a DSP. It is a framework component working with the audio
effects factory in libeffects that must be present on all
products.

Bug: 8174034.
Change-Id: I5035884735a370e9fe87467a45efbf24ba190886

xorware/android_build,xorware/android_build,xorware/android_build,xorware/android_build,xorware/android_build