Check for duplicate uuids when parsing audio_effects.conf

uuids need to be unique, and things don't work properly when they're
not.
Also fix/enhance/extend the dumpEffectDescriptor() method, and
include a list of effects in audioflinger dumpsys.

Change-Id: I3dfbc5ed0f7272c7809e337f2929212ece047ee4
3 files changed