audio policy service: Add introspection API to retrieve AudioProductStrategies

This CL adds required introspection APIs to deal with product strategies:

-getter of the collection of product strategies
-helper function to return the strategy associated to a given attributes.
This API is mandatory to avoid duplicating the logic that compiles the strategy
for a given Audio Attributes structure.

Test: make

Change-Id: I0e107570a44227bb52a4f359954c93215d4f8bae
Signed-off-by: François Gaffie <francois.gaffie@renault.com>
diff --git a/services/audiopolicy/engineconfigurable/Android.mk b/services/audiopolicy/engineconfigurable/Android.mk
index df813cb..13d874a 100644
--- a/services/audiopolicy/engineconfigurable/Android.mk
+++ b/services/audiopolicy/engineconfigurable/Android.mk
@@ -57,6 +57,7 @@
     libaudioutils \
     libparameter \
     libmedia_helper \
+    libaudiopolicy \
     libxml2
 
 include $(BUILD_SHARED_LIBRARY)