cas: add CAS hal

Add CAS hal definitions and default service implementation.

bug: 22804304

Change-Id: I0a89608fe75c5f3c5e6888f9b771305742760707
diff --git a/cas/1.0/default/android.hardware.cas@1.0-service.rc b/cas/1.0/default/android.hardware.cas@1.0-service.rc
new file mode 100644
index 0000000..93de794
--- /dev/null
+++ b/cas/1.0/default/android.hardware.cas@1.0-service.rc
@@ -0,0 +1,6 @@
+service cas-hal-1-0 /vendor/bin/hw/android.hardware.cas@1.0-service
+    class hal
+    user media
+    group mediadrm drmrpc
+    ioprio rt 4
+    writepid /dev/cpuset/foreground/tasks