Fixes delay when playing first sound in BootAnimation

audioplay is initialized with an example of the type of clip it
will play.
Also remove asserts and debug compile settings from BootAnimation.

BUG:24800792
Change-Id: Icb78489417aee0549c340c746b25e57ccdb3427e
diff --git a/cmds/bootanimation/audioplay.h b/cmds/bootanimation/audioplay.h
index bdc0a1c..0e5705a 100644
--- a/cmds/bootanimation/audioplay.h
+++ b/cmds/bootanimation/audioplay.h
@@ -22,10 +22,12 @@
 
 namespace audioplay {
 
-void create();
+// Initializes the engine with an example of the type of WAV clip to play.
+// All buffers passed to playClip are assumed to be in the same format.
+bool create(const uint8_t* exampleClipBuf, int exampleClipBufSize);
 
-// Play a WAV pointed to by buf.  All clips are assumed to be in the same format.
-// playClip should not be called while a clip is still playing.
+// Plays a WAV contained in buf.
+// Should not be called while a clip is still playing.
 bool playClip(const uint8_t* buf, int size);
 void setPlaying(bool isPlaying);
 void destroy();