Audioflinger dumpsys: Use libjsoncpp for json dump

Test: dumpsys media.audio_flinger --json
Bug: 68148948
Change-Id: Ieebe2c52e3613e48a5ec5cbb2b1f167a32d5a47d
diff --git a/media/audioserver/Android.mk b/media/audioserver/Android.mk
index 70c281a..8a97299 100644
--- a/media/audioserver/Android.mk
+++ b/media/audioserver/Android.mk
@@ -21,6 +21,9 @@
 	libsoundtriggerservice \
 	libutils
 
+LOCAL_STATIC_LIBRARIES := \
+	libjsoncpp
+
 # TODO oboeservice is the old folder name for aaudioservice. It will be changed.
 LOCAL_C_INCLUDES := \
 	frameworks/av/services/audioflinger \