Effects: set effect monitor flag to track volume

use effect volume monitor flag to get requested volume from
audio framework.

Bug: 123251705
Test: on/off equalizer on spotify/google music
      switch songs with equalize

Change-Id: I0db8019a00b08fcbec096ff7d6581c26d35ee752
Signed-off-by: Jasmine Cha <chajasmine@google.com>
(cherry picked from commit 30b77e0cc6f57af431eb904e09eaa79d38c2c609)
diff --git a/post_proc/ma_listener.c b/post_proc/ma_listener.c
index 9271dc7..e462646 100644
--- a/post_proc/ma_listener.c
+++ b/post_proc/ma_listener.c
@@ -28,7 +28,7 @@
 #include <audio-base.h>
 
 #define MA_FLAG ( EFFECT_FLAG_TYPE_INSERT | \
-                   EFFECT_FLAG_VOLUME_IND | \
+                   EFFECT_FLAG_VOLUME_MONITOR | \
                    EFFECT_FLAG_DEVICE_IND | \
                    EFFECT_FLAG_OFFLOAD_SUPPORTED | \
                    EFFECT_FLAG_NO_PROCESS)