Visualizer: Add multichannel capability

Test: CTS VisualizerTest with multichannel USB devices
Bug: 118895139
Change-Id: I438708842f2d4cd490120c3a700047d96b93c3be
diff --git a/media/libeffects/visualizer/Android.mk b/media/libeffects/visualizer/Android.mk
index 3534149..35e2f3d 100644
--- a/media/libeffects/visualizer/Android.mk
+++ b/media/libeffects/visualizer/Android.mk
@@ -9,6 +9,7 @@
 
 LOCAL_CFLAGS+= -O2 -fvisibility=hidden
 LOCAL_CFLAGS += -Wall -Werror
+LOCAL_CFLAGS += -DBUILD_FLOAT -DSUPPORT_MC
 
 LOCAL_SHARED_LIBRARIES := \
 	libcutils \