Express libmedia dependencies in libaudiopolicycomponents

Although this library does not itself need to be linked with libmedia,
consuming libraries need access to libmedia's headers when they consume
the public interface to this library.

Bug: 27804373
Test: Compiles.

Change-Id: I03b4404914c9930093a20e8293d9034b84d85ca9
diff --git a/services/audiopolicy/common/managerdefinitions/Android.mk b/services/audiopolicy/common/managerdefinitions/Android.mk
index 8728ff3..e608e64 100644
--- a/services/audiopolicy/common/managerdefinitions/Android.mk
+++ b/services/audiopolicy/common/managerdefinitions/Android.mk
@@ -20,9 +20,12 @@
 
 LOCAL_SHARED_LIBRARIES := \
     libcutils \
+    libmedia \
     libutils \
     liblog \
 
+LOCAL_EXPORT_SHARED_LIBRARY_HEADERS := libmedia
+
 LOCAL_C_INCLUDES += \
     $(LOCAL_PATH)/include \
     $(TOPDIR)frameworks/av/services/audiopolicy/common/include \