Start splitting allocation into hal and core.

Change-Id: Ic506abb0469238cb0471eb1401cfcb7b2fbbe4bb
diff --git a/libs/rs/rsContext.h b/libs/rs/rsContext.h
index be615a3..4ba00fe 100644
--- a/libs/rs/rsContext.h
+++ b/libs/rs/rsContext.h
@@ -270,6 +270,13 @@
         ObjectBase::zeroAllUserRef(this);
     }
 
+    struct Hal {
+        void * drv;
+
+        RsdHalFunctions funcs;
+    };
+    Hal mHal;
+
     ElementState mStateElement;
     TypeState mStateType;