Add SELinux MAC to DrmManagerService.

Add SELinux checks on all interfaces exposed by the
DrmManagerService.

Change-Id: Ib170d3229d88781b76e5fc1c557c8fed233df5d1
diff --git a/drm/drmserver/Android.mk b/drm/drmserver/Android.mk
index aa0ab9b..48ea385 100644
--- a/drm/drmserver/Android.mk
+++ b/drm/drmserver/Android.mk
@@ -26,7 +26,8 @@
     libutils \
     liblog \
     libbinder \
-    libdl
+    libdl \
+    libselinux
 
 LOCAL_STATIC_LIBRARIES := libdrmframeworkcommon