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
diff --git a/services/audioflinger/AudioFlinger.cpp b/services/audioflinger/AudioFlinger.cpp
index e48af20..78aeb4b 100644
--- a/services/audioflinger/AudioFlinger.cpp
+++ b/services/audioflinger/AudioFlinger.cpp
@@ -401,6 +401,9 @@
             String8 result(kClientLockedString);
             write(fd, result.string(), result.size());
         }
+
+        EffectDumpEffects(fd);
+
         dumpClients(fd, args);
         if (clientLocked) {
             mClientLock.unlock();