Audio Policy Refactor: reorganise headers inclusion

This patch reoganises the headers inclusion in order to prepare
the split of managerdefault into a manager and a separated lib
of pillar policy elements.

It also moves back the isStrategyActive to the manager to avoid
any dependancies from this pillars to the manager.

Change-Id: I1a35c45d86db7a3878a40dc7d6858dfea37c5ac9
Signed-off-by: François Gaffie <francois.gaffie@intel.com>
diff --git a/services/audiopolicy/managerdefault/Gains.cpp b/services/audiopolicy/managerdefault/Gains.cpp
index 4aca26d..98a8d1c 100644
--- a/services/audiopolicy/managerdefault/Gains.cpp
+++ b/services/audiopolicy/managerdefault/Gains.cpp
@@ -24,7 +24,9 @@
 #define ALOGVV(a...) do { } while(0)
 #endif
 
-#include "AudioPolicyManager.h"
+#include "Gains.h"
+#include <utils/Log.h>
+#include <utils/String8.h>
 
 #include <math.h>