Audio policy: implement configuration file in XML

This patch introduces configuration file of the policy in XML.
Legacy configuration file is used by default and
compilation flag USE_XML_AUDIO_POLICY_CONF must be defined to
use XML file format.

Change-Id: I352b788b5829d42ed82c851a4faef0e526be582e
Signed-off-by: François Gaffie <francois.gaffie@intel.com>
diff --git a/services/audiopolicy/engineconfigurable/Android.mk b/services/audiopolicy/engineconfigurable/Android.mk
index b18c520..06d00ca 100755
--- a/services/audiopolicy/engineconfigurable/Android.mk
+++ b/services/audiopolicy/engineconfigurable/Android.mk
@@ -41,7 +41,11 @@
 LOCAL_STATIC_LIBRARIES := \
     libmedia_helper \
     libaudiopolicypfwwrapper \
-    libaudiopolicycomponents
+    libaudiopolicycomponents \
+
+ifeq ($(USE_XML_AUDIO_POLICY_CONF), 1)
+LOCAL_STATIC_LIBRARIES += libxml2
+endif
 
 LOCAL_SHARED_LIBRARIES := \
     libcutils \