audio policy: remove deserialization from policy objects

This patch removes the responsability of the deserialization of all
objects managed by the policy by:
-adding required accessors
-moving deserialization function to Config parser helper
-adds a TypeConverter to associate string to / from values of all
audio enumeration shared between HALs and policy.

Change-Id: I1ce798848f4657b37e47446c9fbdc63f7ed0390e
Signed-off-by: François Gaffie <francois.gaffie@intel.com>
diff --git a/services/audiopolicy/Android.mk b/services/audiopolicy/Android.mk
index 5b38e1c..671d7fb 100644
--- a/services/audiopolicy/Android.mk
+++ b/services/audiopolicy/Android.mk
@@ -24,6 +24,7 @@
     $(call include-path-for, audio-utils) \
     $(TOPDIR)frameworks/av/services/audiopolicy/common/include \
     $(TOPDIR)frameworks/av/services/audiopolicy/engine/interface \
+    $(TOPDIR)frameworks/av/services/audiopolicy/utilities \
 
 LOCAL_SHARED_LIBRARIES := \
     libcutils \
@@ -84,6 +85,7 @@
 LOCAL_C_INCLUDES += \
     $(TOPDIR)frameworks/av/services/audiopolicy/common/include \
     $(TOPDIR)frameworks/av/services/audiopolicy/engine/interface \
+    $(TOPDIR)frameworks/av/services/audiopolicy/utilities \
 
 LOCAL_STATIC_LIBRARIES := \
     libmedia_helper \