Start seperating out RS compute implementation.  Create hal
layer to seperate from runtime.

Change-Id: Idf5c1261be4131690d25c15948e98324e979b4f9
diff --git a/rsContext.cpp b/rsContext.cpp
index a7c0180..7dc26d2 100644
--- a/rsContext.cpp
+++ b/rsContext.cpp
@@ -688,6 +688,10 @@
     timerInit();
     timerSet(RS_TIMER_INTERNAL);
 
+    if (!rsdHalInit(this, 0, 0)) {
+        return false;
+    }
+
     int cpu = sysconf(_SC_NPROCESSORS_ONLN);
     LOGV("RS Launching thread(s), reported CPU count %i", cpu);
     if (cpu < 2) cpu = 0;